About the book: 2007 / The mutilated corpse of a man is found in a deserted place. The police quickly manage to get on the trail, and the case that Detective Kusanagi is investigating seems simple at first glance: there is the body of the victim, there is an obvious suspect - the ex-wife of the murdered man, whose alibi Kusanagi is trying to refute. But despite the best efforts of the police, every time something doesn’t add up, as if the most important piece of the puzzle is missing. It’s as if behind the crime there is a mathematical genius who has calculated all possible combinations in advance. Kusanagi's friend, physics professor and amateur detective Manabu Yugawa comes to Kusanagi's aid.…