日本語
Poison Hidden in the Ice (illustration)
FILE No.89Unsolved

Poison Hidden in the Ice

Difficulty ★★☆about 5 minEveryday MysteryIceTiming
Three people had the same iced drink at a summer party. Only the victim died. Where was the poison?

Case Record

One summer afternoon, three people (the victim, friend A and friend B) drank the same drink with ice at a garden table. Only the victim died. A and B were fine.

The bottle was tested afterwards, and no poison was found. The glasses had already been washed before the police arrived, so they could not be tested.

It was hot, so A and B drank theirs down quickly. The victim was deep in conversation and drank slowly, over a long time.

Your question

How did the culprit put in the poison?

Case Files

Evidence

Diagram

Same drink, same icePersonHow they drankResultVictimSlowlyDiedAGulped it downFineBGulped it downFineNo poison in the bottle. The glasses were washed.
Diagram

Timeline

  1. Three people drink iced drinks in a garden.

Hints

If you get stuck, open the hints one at a time, in order.

Open hint 1

How did A and B drink compared with the victim?

Open hint 2

Was poison found in the bottle?

Open hint 3

Ice takes time to melt.

Solve It

Your question

How did the culprit put in the poison?

Choose the answer closest to the truth.

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The Truth

Froze the poison into the middle of an ice cube, so it only reached the drink once the ice melted, which happened to the victim who drank slowly

The answer is: froze the poison into the middle of an ice cube, so it only reached the drink once the ice melted, which happened to the victim who drank slowly.

Poison frozen in the core of the ice is released only when the ice melts. A and B finished before the ice melted, so they never swallowed any. The victim, drinking slowly, drank the drink after the ice melted and the poison mixed in. The clean bottle fits this as well.

Frozen in the iceFreeze poison inside the centre of an ice cubeDrinking fast: the ice has not melted, no poison is swallowedDrinking slowly: the ice melts and the poison mixes in
Diagram of the solution

Key Points

  • The way they drank is a clue
  • Think of a trick that releases poison only after a delay
  • Use the fact that the bottle was clean

Why people get fooled

People assume the poison was in the drink from the start.

Similar tricks

  • The timing type
  • The how-they-drank type

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