Homicide detectives Mark Amos and Zac Harris are called out in the early hours of a cold, wet morning to investigate a naked corpse curled up in a laneway off Exhibition Street, Melbourne. The face of the corpse is twisted in torment. Numerous knife wounds and cigarette burns litter the torso. The experienced detectives have not seen anything like it. There are no clues and the dead man is unidentifiable. But they can feel the perpetrator's frenzied...