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The Dinner Party Photo (illustration)
FILE No.16Unsolved

The Dinner Party Photo

Difficulty ★☆☆about 3 minContradictory TestimonyWho is countedWho takes the photo
Six people were at the party, and six appear in the photo. Why do the police think someone else was there?

Case Record

A small dinner party was held in a secluded mansion. The host prepared the meal and the guests helped serve. The servants were off, and the front door was locked once everyone had arrived.

The six participants that night were the host couple, Mori, Kishi, Murakami and Noguchi.

During the meal the host took one commemorative photo with an old camera from his collection, a traditional one operated by hand from focusing to winding the film.

The party ended pleasantly. After the guests left, however, the host noticed that the pocket watch displayed in his study was missing.

The next morning the police checked the participants’ accounts and the remaining photo.

Your question

Why did the police realize there was someone to investigate besides the participants?

Case Files

Evidence

Diagram

Diagram

Timeline

  1. The host couple and four guests gather.
  2. The commemorative photo is taken.
  3. The host notices the pocket watch is missing.
  4. The police check the photo and accounts.

Hints

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

Open hint 1

Is the number of people in a photo always the same as the number of people present?

Open hint 2

Combine the fact that all six appear with the description of the camera.

Open hint 3

Who pressed the shutter?

Solve It

Your question

Why did the police realize there was someone to investigate besides the participants?

Choose the answer closest to the truth.

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The Truth

Someone must have taken the photo

The answer is “Someone must have taken the photo.”

There were six participants and six people in the photo, so the numbers seem to match. But if all six are in the picture, someone else operated the camera. At least seven people were there. Preparing the meal and locking the door could be done by the participants, and there is no record of anyone repairing the watch. The police need to identify the person who took the photo and check whether he or she was involved in the loss of the watch.

Who is missing from the countSix participants, six in the photoThe camera needs someone to press the shutterThat person is not among the sixAnswer: someone took the photo
Diagram of the solution

Key Points

  • Even when numbers match, check what was counted
  • Think of the person taking the photo as well as those in it
  • Separate the existence of a person from involvement in the crime

Why people get fooled

Because both counts are six, you relax. You forget to count the person needed to take the photo.

Similar tricks

  • Noticing someone outside the record
  • Same number, different range counted

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