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The Postmark on the Warning (illustration)
FILE No.36Unsolved

The Postmark on the Warning

Difficulty ★☆☆about 3 minCodes & CiphersWeekdaysPhrasing
A warning letter arrives at a mansion. The deed will be done "two days after the day before the day after tomorrow." Two pieces of evidence help you find the weekday.

Case Record

On Sunday morning, a warning letter from a phantom thief arrived at a mansion.

The letter read:

"I hear the mansion will hold its annual masquerade ball tomorrow.

But I will not take the jewel on that day.

Counting from today, the day I am writing this letter, the deed will be done two days after the day before the day after tomorrow."

The letter had no date written on it.

Your question

Using the evidence too, what day of the week has the thief announced for the theft?

Case Files

Evidence

Timeline

  1. The masquerade ball is held. The envelope is postmarked.
  2. The warning letter arrives at the mansion.

Hints

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

Open hint 1

A postmark does not directly tell you the day the letter was written.

Open hint 2

Compare the line "The ball is tomorrow" with the mansion’s record of the ball.

Open hint 3

Work out the weekday the letter was written, then follow "the day after tomorrow," "the day before" and "two days after" in order.

Solve It

Your question

Using the evidence too, what day of the week has the thief announced for the theft?

Choose the answer closest to the truth.

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The Truth

Monday

The answer is: Monday.

The envelope has a Saturday postmark, but the day the letter was written is not necessarily Saturday.

The letter says, "The masquerade ball is tomorrow." The ball was actually held on Saturday, so the letter must have been written on Friday.

Starting from Friday, follow the phrase in order.

  • The day after tomorrow: Sunday
  • The day before that: Saturday
  • Two days after that: Monday

So the deed will be done on Monday.

If you count from the Saturday postmark, you get Tuesday, which is wrong. What matters is telling the postmark date apart from the day the letter was written.

Key Points

  • Do not take the postmark for the day of writing
  • Match the letter’s "tomorrow" with the record of the event
  • Find the writing day first, then follow the phrase step by step

Why people get fooled

You take the Saturday postmark for the day of writing and miss the one-day gap.

Similar tricks

  • The type that adds and subtracts days
  • The type that turns phrasing into numbers

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