The detective agency “Coffin Robin” accepts cases only when the crime itself is intriguing enough to capture their interest. Its founder, Tasuku Kosaka, is a brilliant detective and former criminal psychologist. What fascinates him is not the incident, but the crime itself—not the victim, but the perpetrator. What chain of causes and emotions drove someone to commit such a sin? That answer alone is what he seeks, and it is for that reason alone that the scholar became a detective. ...The dead tell no tales. Knowing this all too well, the robin faces the coffin and asks: “Who killed you?” A gripping detective thriller that delves into the psychology of criminals and the truths hidden behind their crimes.