日本語
The Clue of “S” (illustration)
FILE No.54Unsolved

The Clue of “S”

Difficulty ★★☆about 5 minCodes & CiphersUnfinished writingNarrowing by alibi
The manager left a mark like “S.” Compare it with his notebook and narrow down by alibi.

Case Record

At about 2 p.m., the manager of an apartment building was killed. At the scene there was a mark like an “S” that the manager wrote at the end.

Mr. Hashitani, Room 104
Mr. Karita, Room 801
Mr. Kiritani, Room 710
Mr. Miyashita, Room 417
Mr. Wakatsuki, Room 815

At about 2 p.m., the three without alibis are Hashitani, Kiritani and Wakatsuki.

Your question

Which resident’s room is the culprit’s? Compare the evidence as well.

Case Files

Evidence

The mark left at the scene, and the residents’ alibis

Rooms containing 8RoomResidentAlibi801KaritaYes815WakatsukiNo104, 710Hashitani, KiritaniNo (no 8 in room)417MiyashitaYes (no 8)Which room has an 8 and no alibi?
The mark left at the scene, and the residents’ alibis

Hints

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

Open hint 1

Check the manager’s habit in the evidence.

Open hint 2

Compare the mark at the scene with other pages of the notebook.

Open hint 3

Remove the people with alibis.

Solve It

Your question

Which resident’s room is the culprit’s? Compare the evidence as well.

Choose the answer closest to the truth.

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The Truth

Mr. Wakatsuki, Room 815

The answer is “Mr. Wakatsuki, Room 815.”

The manager always noted room numbers as digits. The “S” at the scene is not an initial but the point where he stopped after starting to write an “8.” Other pages of the notebook have the same kind of unfinished shape. Rooms containing an 8 are 801 and 815. Mr. Karita in 801 has an alibi, so Mr. Wakatsuki in 815, who has none, is the culprit.

From “S” to a roomThe manager wrote room numbers in digits“S” is an unfinished 8Rooms with 8: 801 and 815; Karita has an alibiAnswer: Wakatsuki, Room 815
Diagram of the solution

Key Points

  • Unfinished writing
  • Other pages of the notebook
  • Narrow by alibi

Why people get fooled

You assume the “S” is a letter of the alphabet.

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