The waterways of the Liverpool docks contain many ghosts and shadows. It's a place to disappear... a place to die.
Detective Inspector April Decent and Detective Sergeant Skeeter Warlock are fearful for the welfare of a vulnerable young man injured in an attack ordered by drug dealers. Originally questioned at the scene, the young man denies the attack and refuses to co-operate with the police. He soon disappears. Clues to his whereabouts are sown, a cry for help maybe, but he remains elusive.
At the same time, the team are dealing with a spate of deaths in the city. The one thing the deaths have in common: the victims are all homeless and seemingly ravaged by addiction. Initially, the deaths are not considered to be suspicious as there is no obvious connection. Soon the hallmarks of murder are discovered and a hunt for a potential serial killer is on.
Is there a link between the missing man and the deaths? Could he be the vital piece of the puzzle which will solve the mystery behind the brutal murders?