The story revolves around a series of murders occurring in Tokyo. The common elements in the cases are an X carved with blood in the victim’s neck, and the fact that the murderer is found close to the victims, but does not remember a thing. Detective Takabe and psychologist Sakuma are trying to find out what happened, but their research reaches a dead end. Eventually, one man named Mamiya emerges as the common link among the murders.
Instead of resorting to plot twists and reversals, Kurosawa gradually creates a maze that combines terror with confusion, in a tactic that exemplifies the ingenuity of both his direction and writing.