Hades

Two children were abducted two decades ago and left to die. A criminal mastermind took them in and raised them, and they later became police officers, an unusual path for anyone with that start. Homicide detective Frank Bennett is paired with a new partner, Eden Archer, a composed and guarded woman whom he finds harder to read than anyone he has worked with, her brother Eric included. Eric is also a member of the Sydney Metro police. The three are pushed to their limits when a man in the area finds a cache of heavy steel toolboxes resting on the harbor floor, each filled with human remains. Frank sees the killer's messages as a puzzle to solve. For Eden and Eric, the crimes reach back to a damaged childhood and to a murderous mentor known as Hades. The story hints that the real darkness extends past the work of one serial killer.