At 9:47 on a Tuesday night, a state auditor was found dead in the clock tower of Coldwater Town Hall. The town has already decided who did it. The town is wrong. The mayor is a liar, a cheat, and an embarrassment to the county. He is not a murderer. The real killer's name is printed somewhere in this book — one name among the 16,560 residents of the Coldwater County census ledger — and eleven pieces of evidence are all you get. This is not a novel. It is a single puzzle, and you solve it with a pencil. Clue one narrows the county to three districts. Every clue after it cuts deeper: a cipher wheel that only encodes odd-lettered names, a monogrammed handkerchief, a laundry ticket, a hotel register, indentation marks on a desk blotter. Strike out every name a clue eliminates. A name struck out is innocent and never comes back. A checkpoint card tells you exactly how many suspects should remain after each clue, so you always know whether your last cut was clean. Four thousand nine hundred sixty-eight after the first. Eighty-two by the seventh. Two by the tenth. When one name is left, that name is the killer. The verdict is printed in reverse at the back so your eye cannot catch it early. Every clue is a checkable fact. No trick wording, no hidden meanings, no outside knowledge required. The solution has been verified name by name, and there is exactly one. For adults who prefer a mystery earned rather than told. No apps, no batteries, no spoilers. Just you, a pencil, and 16,560 suspects.