Detective Riddles

Five detective riddles with the solution under a cover: crime riddles with a theft, a clue and nobody hurt.

Detective Riddles

A lemon cake vanished from the bake sale on the hottest afternoon of the summer. Ana says she was at the library, and the librarian agrees. Ben says he was walking his dog, and a neighbor waved to him. Cal says he was ice skating on Miller's Pond. Whose alibi cannot be true?
The lemonade stand's cash box was emptied while Ned was away. "I was gone one minute," he says. On the counter stands the glass he poured just before he left, with five ice cubes in it, he says. Now it holds lukewarm lemonade and no ice. What does the glass say?
The farm's dinner bell is missing. On its hook hangs a card: TFOL YAH EHT NI. The farmer is baffled. The detective reads the card once and sends two children to fetch the bell. Where is it?
The note in the paint cupboard reads: "I have borrowed the colour chart and the grey paint. Look in the centre drawer." Two of the three helpers grew up in Ohio. The third moved from England last month. Which helper does the detective ask first?
The school trophy went missing during the lunch hour, in a downpour. Pat says she was in the art room, and her brush is still wet. Quin says he ran ten laps of the field, yet his shirt and hair are dry. Rae says she ate in the cafeteria, and forty people saw her. Who has some explaining to do?

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How it works

Each of these detective riddles is a short case: something is missing, the suspects speak, and one detail gives the culprit away. Nobody is hurt in any of them. Work out who did it, then open the solution.

Read the full guide

From false alibis to crime scene riddles

The menu under the button keeps one kind. In The lie in the alibi one story cannot be true. In The clue at the scene the room tells you. Who had the chance narrows times, keys and statements down to one person. In Notes and codes left behind the culprit wrote too much.

How to run a case

Read the case aloud once, slowly. Players may ask you to repeat a sentence, never to add one. Take one answer with a reason, then tap Show answer: the clue that settles it comes right after the name.

Tips

Have players write the culprit and the reason first. A right name with a wrong reason scores half.

Questions and answers

Are these mystery riddles with answers?

Yes. Every case has its solution under a cover, with the one clue that proves it: a train that cannot arrive on time, a dry coat on a wet day, the first letters of a note. Show all answers opens the whole key.

Can kids solve these detective riddles?

Many can. The cases are thefts and pranks, such as a missing cake or a hidden bell, and nobody is hurt in any of them. The Easy cases turn on one plain fact, such as where the sun rises.

How do you solve a detective riddle?

Look for the one detail that cannot be true, or that only the culprit could know. Check dates and times against the calendar and the clock, ask who was really there, and read any note letter by letter.

What is an example of a detective riddle?

Tulips are trampled at noon. One suspect says she was in the park flying her kite the whole time, and the weather service reports no wind all day. A kite needs wind, so her alibi fails.

All 40 cases

The lie in the alibi 10

A lemon cake vanished from the bake sale on the hottest afternoon of the summer. Ana says she was at the library, and the librarian agrees. Ben says he was walking his dog, and a neighbor waved to him. Cal says he was ice skating on Miller's Pond. Whose alibi cannot be true? Answer: Cal. A pond is not frozen on the hottest afternoon of the summer.
A necklace vanished from the museum at noon on a midsummer day. Eve says she was across town on top of the clock tower, and she shows a photo she took "at exactly twelve." In the photo the tower's shadow reaches all the way across the square. Finn says he was in the cafe, and the waiter agrees. Whose proof proves the opposite? Answer: Eve's. Shadows are shortest at midday, when the sun is highest. A long shadow means the photo was taken early or late in the day.
A power cut darkened Maple Street from eight to nine last night, and in that hour a bicycle was taken from a porch. Gus says he was playing chess by candlelight with his sister. Hal says he plugged in the vacuum cleaner and did the stairs. Ivy says she sat on her step and counted stars. Whose alibi falls apart? Answer: Hal. A vacuum cleaner that plugs into the wall cannot run during a power cut.
A small bronze frog was taken from the gallery at half past four. Guy says, "I was on the 4:10 train by then. The ride takes fifty minutes and the walk home from the station twenty, and I came through my door as the clock struck five." His sister says she was at work, and her boss agrees. What is wrong with Guy's story? Answer: His times do not add up. 4:10 plus fifty minutes plus twenty is 5:20, so a man on that train could not be home at five.
The answer key was copied from the teacher's desk on Friday. Nobody had told the class where it was kept. Zoe says she was at the dentist. Abe says, "It was not me. I did not even know the key was in the top left drawer." Bea says she was at band practice. Who gave themselves away? Answer: Abe. He named the drawer, which only the person who found the key could know.
The class piggy bank was emptied on Saturday afternoon. Dee says she was at her grandmother's, and her grandmother agrees. Eli says he was at the two o'clock show at the Rex. Fay says she was at the dentist, and she has the appointment card. The Rex has been closed for repairs since spring. Whose story does not hold? Answer: Eli's. A theater that is closed for repairs has no two o'clock show.
The harbor master's logbook was torn on Tuesday night. Sam says he saw nothing because he was on the beach, admiring the full moon. Tia says she stayed indoors because there was no moon and the path was too dark. The almanac shows a new moon for Tuesday. Who lied? Answer: Sam. At new moon the Moon cannot be seen in the night sky, so there was no full moon to admire.
The school trophy went missing during the lunch hour, in a downpour. Pat says she was in the art room, and her brush is still wet. Quin says he ran ten laps of the field, yet his shirt and hair are dry. Rae says she ate in the cafeteria, and forty people saw her. Who has some explaining to do? Answer: Quin. Nobody runs ten laps in a downpour and comes back dry.
Somebody flattened Mrs. Okoye's tulips at noon. Jon says he was fishing at the pond, and he holds up three fish. Kit says she was in the park flying her kite the whole time. Lou says he was at his piano lesson. The weather service says there was not a breath of wind all day. Whose alibi fails? Answer: Kit. A kite is held up by moving air, so it will not stay up on a windless day.
Wes says he was in his canoe at dawn, watching the sun come up over the western shore. Why is he lying? Answer: The sun rises in the east. Nobody can watch a sunrise over a western shore, so Wes was somewhere else at dawn.

The clue at the scene 10

A classroom window was broken overnight, and the globe is gone. The custodian says a burglar smashed his way in. The detective finds the floor inside clean and every piece of glass lying in the flower bed outside. What does that tell her? Answer: The window was broken from the inside. Glass falls away from the blow. Nobody smashed a way in: somebody who was already inside broke it.
A ham vanished from the kitchen in the night. Biscuit the terrier sleeps by the kitchen door and barks at every stranger, even the mail carrier she sees each day. Last night she never made a sound. The cook suspects a burglar. What does the quiet dog tell the detective? Answer: The ham was taken by somebody the dog knows. A stranger would have set her barking, so it was a member of the household.
The cookie tin in the pantry was emptied. The pantry door was locked from the inside, with the key still in the lock. The small window is shut but not latched, and on the ground under it lies a broken flowerpot from the sill. How did the cookie thief leave? Answer: Through the window. The door was locked from within, so the window was the only way out, and the pot was knocked off the sill in passing.
Fresh snow stopped falling at seven last night, and by morning the snowman's hat was gone. Mo says he stayed in, and the snow outside his door is smooth. Nan says she stayed in too, yet a line of boot prints runs from her door to the snowman and back. Oz was away all week. Who took the hat? Answer: Nan. The only tracks in the fresh snow start and end at her door.
The housekeeper says she was alone all afternoon when the silver bell went missing. On the kitchen table the detective finds two teacups, both still warm, two plates with crumbs, and two chairs pulled out. What does the table tell her? Answer: The housekeeper had a visitor. Two warm cups mean two people sat there a few minutes ago.
It has rained hard since noon. At four a painting is found missing, and three visitors are asked when they came in. All three say, "An hour ago, straight from the street." Two umbrellas in the stand sit in puddles. The third, Mr. Dray's, is bone dry, and so is his coat. What does the detective ask Mr. Dray? Answer: Where he really was an hour ago. A dry umbrella and a dry coat did not come through an hour of hard rain. He was indoors well before he says.
Lady Finch lit a new candle at eight and locked her study. That kind of candle burns down one inch an hour. Her butler says he unlocked the study at nine, saw that her brooch was gone, and blew the candle out at once. The candle is three inches shorter than a new one. Why does the detective doubt him? Answer: The candle burned for three hours, not one. Three inches at an inch an hour puts the flame out at about eleven, two hours after the butler says.
The lemonade stand's cash box was emptied while Ned was away. "I was gone one minute," he says. On the counter stands the glass he poured just before he left, with five ice cubes in it, he says. Now it holds lukewarm lemonade and no ice. What does the glass say? Answer: Ned was gone far longer than a minute. Five ice cubes do not melt away in a minute, and the drink had time to warm up as well.
The park bench was painted green at nine. By ten somebody had hidden the WET PAINT sign and sat down on the bench to watch the fun. Three people are still in the park: one has grass stains on her knees, one has mud on his shoes, and one has a green stripe across the back of his coat. Who does the gardener want a word with? Answer: The man with the green stripe. Only the wet bench could have painted a stripe across the back of a coat.
The prize apple has one bite out of it, and the bite mark shows a gap right in the middle of the top row. The three cousins grin for the detective. Ada wears braces, Bram has every tooth, and Cleo lost a front tooth last week. Who bit the apple? Answer: Cleo. The gap in the bite matches the gap in her smile.

Who had the chance 10

A toy drum is gone. Each of three children says one true thing and one false thing. Tess: "I did not take it. Uma took it." Uma: "I did not take it. Vik did not take it." Vik: "I did not take it. Uma did not take it." Who took the drum? Answer: Vik. With Vik, each child has exactly one true sentence. With Tess or Uma, somebody would have two true or two false.
The fountain was clear at 10:45 on Saturday night and bright green at 11:15. Ola and Pim were together at the bowling alley until midnight, and the owner agrees. Ravi and Sol were together until ten. After that Sol was at the late movie, and the usher saw her stay until it ended at midnight. Ravi says he walked home alone. Who has nobody to vouch for them? Answer: Ravi. At eleven the other three were each seen somewhere else. That is a chance, and the detective still needs proof.
Four guests, Kay, Lin, Max and Nia, left the party one at a time. The lamp was whole when the second guest left and broken when the third guest left. Kay left first, and Max left right after her. Nia left last. Between the second and third goodbyes, Nia was in the garden with the host. Who broke the lamp? Answer: Lin. The order was Kay, Max, Lin, Nia. After Max left, only Lin and Nia were still there, and Nia was outside with the host.
The gallery's hall clock runs a quarter of an hour slow. The guard saw the silver cup in its case as that clock struck three. The director found the case empty at half past three by the radio, which keeps true time. Lena went home at 3:05 by the radio. Milo went home when the hall clock said 3:10, and Opal came in when it said 3:20. Who was there when the cup went? Answer: Milo. The hall clock's three is really 3:15, so the cup went between 3:15 and 3:30. Lena had left at 3:05, and Opal came in at a true 3:35. Milo was there until a true 3:25.
The guest who walked off with the map wore a red scarf, arrived by boat and is taller than Ivy. Gil wore red and came by boat, but he is shorter than Ivy. Hana wore red, came by boat and is taller than Ivy. Jules is taller than Ivy and came by boat, but his scarf is blue. Who has the map? Answer: Hana. She is the only one who fits all three facts.
The island lighthouse can be reached on foot only across a sandbar that is dry from five to seven in the morning. Between noon and one, somebody painted a smile on the lighthouse door. Ida and Kai have no boat. Ida walked over at six and walked back at half past six. Kai reached the harbor at nine. Jo rowed out alone at eleven and rowed home at two. Who could have painted the door? Answer: Jo. Ida was back on shore before the sandbar flooded, and Kai came too late to walk across. Only Jo was on the island at noon.
The last slice of pie was eaten between two and three o'clock. Ana was at the pool from one until four. Ben napped upstairs until a quarter past two and then stayed in the house until five. Cy left for the store at a quarter to two and came back at half past three. Who was in the house when the pie was eaten? Answer: Ben. Ana was out from one to four and Cy from 1:45 to 3:30. Only Ben was home between two and three.
On Monday the manager told the new safe combination to the clerk and to nobody else. On Tuesday she changed it again and told no one. On Wednesday the safe was opened without a scratch, and the cash was gone. "The clerk knew the combination," says the manager. Why does that not point to the clerk? Answer: The clerk knew only Monday's combination. After Tuesday's change the manager alone could open the safe without forcing it.
Only three keys open the art room: the teacher's, the custodian's and the principal's. The door was locked at four and still locked at eight, when the clay owl was found missing, and the windows do not open. The teacher spent the day at a conference in another city. The principal's key snapped in two last week. Who could have opened the door? Answer: The custodian. Of the three keys, one was out of town and one was broken.
Somebody rang the tower bell at exactly six as a prank. The stairs take ten minutes to climb, and the bakery is two minutes from the tower door. Di was paying for bread in the bakery at 5:55. Ed left the bakery at 5:45. Flo was on the dock at 5:35, twenty minutes' walk from the tower door. Who could have been at the top at six? Answer: Ed. Ed could reach the top by 5:57. Di could not be there before 6:07, nor Flo before 6:05.

Notes and codes left behind 10

A note in the empty cookie jar says only: 13-9-1. The club's secret code is A is 1, B is 2, and so on. The members are Sam, Mia and Ali. Whose name is on the note? Answer: Mia. 13 is M, 9 is I and 1 is A.
A note under the door says: "I will put the trophy back when the hands of the clock first lie exactly on top of each other after noon." Three people left the room alone that afternoon: Bo at half past twelve, Cora at about five past one, and Dell at two o'clock. Who returned the trophy? Answer: Cora. After twelve the two hands next meet a little after five past one.
A scrap of paper in the gym reads: "It is in locker XLIV." Lockers 44, 46 and 64 belong to Jo, Kai and Lee, in that order. Whose locker does the detective open? Answer: Jo's. XLIV is 44: XL is 40 and IV is 4. Locker 46 would be XLVI and 64 would be LXIV.
A witness saw the getaway van only as a reflection in a shop window, and she wrote down the plate exactly as she saw it: MOT 808. Three vans were stopped, with the plates MOT 808, TOM 808 and 808 TOM. Which van was it? Answer: The van with the plate 808 TOM. A mirror reverses left and right, so the plate was read back to front, and these letters and digits look the same either way round.
Every prank note this month was typed, and in each one the letter E prints as a faint smudge. The school has three typewriters: the library's is new, the office's has a sticking space bar, and the drama room's has a worn-out E. Where were the notes typed? Answer: In the drama room. The smudged E on every note matches the worn E of that one machine.
The farm's dinner bell is missing. On its hook hangs a card: TFOL YAH EHT NI. The farmer is baffled. The detective reads the card once and sends two children to fetch the bell. Where is it? Answer: In the hay loft. The whole line is written backward: IN THE HAY LOFT.
The message on the answering machine is three keypad beeps: 2, 3, 6. On a telephone keypad, 2 carries ABC, 3 carries DEF and 6 carries MNO. The three people with a key are Ben, Kim and Sal. Whose name fits the digits? Answer: Ben. B is on 2, E on 3 and N on 6. Kim would be 5-4-6 and Sal 7-2-5.
The note in the paint cupboard reads: "I have borrowed the colour chart and the grey paint. Look in the centre drawer." Two of the three helpers grew up in Ohio. The third moved from England last month. Which helper does the detective ask first? Answer: The helper from England. Colour, grey and centre are British spellings. An American would more likely write color, gray and center.
The pie thief left a note on the empty plate: "Come And Race Later!" The suspects are Carl, Lena and Omar. Read the first letter of each word. Who signed without meaning to? Answer: Carl. The capitals spell C, A, R, L.
The thief left four lines on the gallery wall: Nobody saw me come or go. / Only the cat was awake. / Really, your lock was easy. / A better guard would help. The guards on duty were Aron, Nora and Oran. Read down the first letters. Who wrote it? Answer: Nora. The first letters of the four lines are N, O, R, A, in that order.

How this list was compiled

Written by the Game Night Generator editors on October 3, 2026: 40 short cases in four sets of 10. Nobody dies and nobody is hurt in any of them: the cases are thefts, pranks and false alibis. The people and places are invented, and the wording is the editors' own; a few cases retell an old puzzle idea (the dog that did not bark, the note with a hidden name) in a new setting, and none was copied from a collection. Every case that rests on a count, a code or a set of statements was solved by a script for exactly one answer: the times and train sums, the truth-and-lie statements, the leaving order, the letter and number codes, the Roman numerals and the clock hands. The facts the other solutions lean on were read on October 3, 2026 in the English Wikipedia articles New moon, Noon, Sunrise, Kite, Telephone keypad and American and British English spelling differences (en.wikipedia.org). The three levels are the editors' judgment; no second person test-solved the cases. This site is not connected with Wikipedia. Licence: own work