Жертва подозреваемого Х

The mutilated corpse of a man was 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 a 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 all efforts police, every time something doesn't fit, like the most important piece is missing from the puzzle. As if behind the crime is a mathematical genius who has calculated in advance all possible combinations. Kusanagi's friend, physics professor and amateur detective Manabu Yugawa, comes to Kusanagi's aid.