Journey under the Midnight Sun - Keigo Higashimo

When a man is found murdered in an abandoned building in Osaka in 1973, unflappable Detective Sasagaki is assigned to the case. He begins to piece together the connection of two young people who are inextricably linked to the crime. Read this book, as we follow Nagasaki pursuing the case to the point of obsession, and find out the crazy things he discovers.