The waterways of the Liverpool docks contain many ghosts and shadows. It’s a place to disappear… or die. 
 
Detective Inspector April Decent and Detective Sergeant Skeeter Warlock fear for the welfare of a vulnerable young man injured in an attack ordered by drug dealers. Originally questioned at the scene, Danny Maynard denies the attack and refuses to co-operate with the police. He soon disappears. Clues to his whereabouts are seeded, a cry for help maybe, but he continues to be elusive. 
 
The team are also dealing with a spate of deaths in the city, with one thing in common: the victims are all homeless and seemingly ravaged by addiction. Once that connection is realised – the hunt for a potential serial killer is on. 
 
Is there a link between the missing man and the other deaths? Could he be the missing piece of the puzzle which will solve the mystery behind the brutal murders?