The Killer Signed the Guest Book
A murder mystery logic puzzle: two records, 17,600 suspects, 19 clues
- Pages
- 242
- Trim size
- 8.5 × 11 in
- Published
- Aug 12, 2026
About the book
Blackmere Hall kept two books apart: a Register with names but no dates, and a Porter’s Log with times but no names. Cross out 17,599 of 17,600 suspects to find the killer.
The front desk kept the Register: every guest’s name, room and terms, and not one date. The door kept the Porter’s Log: every arrival timed to the minute, and not one name. Then a guest was murdered, and the only record of who did it was split across the two.
Some clues describe a name, which only the Register can answer. Some describe an arrival, which only the Log can. Neither book can name the killer alone, so the answer cannot be guessed, skimmed or spotted early.
Who it’s for
Solvers who like a long, careful elimination puzzle they can work on over an evening or a fortnight.
What’s inside
- Three complete cases (22,400 suspects in all) plus a ten-minute worked demonstration
- 19 interlocking clues per case: remove any one and the answer stops being unique
- Checkpoints at clues 5, 10 and 15 with the count you should be holding
- Both records on facing pages, with the same numbers on both
- A 57-step hint ladder that never names a guest
- A detachable clue card and full solutions showing how many suspects survive each clue
Questions about The Killer Signed the Guest Book
Do I need outside knowledge?
No. There are no riddles and no trivia. A pencil is the only tool you need.
What if I go wrong?
The checkpoints and solutions show how many suspects survive each clue, so you can find the clue you misread instead of starting over.
