A controversial memoir by a serial killer who disappeared fifteen years ago after a killing spree in Tokyo and an unsuccessful attempt to be caught, forces a resentful, but brilliant, detective to protect the identity of the author, and the details of the book, from a threatening anonymous cult-like group calling themselves ' Ghosts of Tokyo ', all the while sifting through myriad suspects based on their hundreds of prior aliases, and the detective's own past failures, in a psychological tug-of-war that challenges his perception of morality and justice.