Prices are checked against each store and labelled with when.
It checks today's price at every store, compares the alternatives and answers in about a minute.
This is a logic-deduction puzzle book built around one large case: 25,000 named suspects, 7 clues, and a single killer. Each clue states something that must be true of the culprit, and you eliminate every suspect who fails it until one name is left. The book is pitched at medium difficulty, with a worked example, progress checkpoints and journal pages for notes. It suits adults who like pure elimination puzzles more than narrative whodunits; unlike story-driven mystery books, there is no plot to follow, only a long list to work through.
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This is a logic-based murder mystery puzzle book for adults. The reader plays an armchair detective who must find one guilty name among 25,000 suspects.
The investigation starts with 7 clues. Each clue states something that must be true of the killer. The reader eliminates every suspect who doesn't fit until one name remains.
The clues are fair and literal, with no tricks or red herrings and no guessing required. Applied correctly, they lead to one unique solution. The book is a medium-difficulty challenge.
