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 deduction puzzle in book form, not a novel. Anna leaves 40,000 suspect names and twenty clues; each clue eliminates names until one remains. You strike out names with a highlighter as you go, and the answer is sealed at the back. It suits puzzle solvers and mystery fans who want an active case rather than a plot, and it stands apart from story-driven whodunits because there is no narrative, no red herrings and no guessing.
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One of Them Killed Anna is a murder mystery logic puzzle by V. H. Blackwell. Anna is dead, and she left behind a list of 40,000 suspects and twenty precise clues about her killer. It is a case to be solved, not a story to be read.
Work through the clues one at a time. Each clue eliminates part of the suspect list, and a highlighter is used to strike out every name that does not fit. After all twenty clues are applied, one name remains: the killer.
The puzzle relies on deduction alone. It has no narrative tricks, no red herrings and no guesswork. The answer is sealed at the back of the book.
