A Matter of Blood — Sarah Pinborough

In a world steeped in darkness, a new breed of evil has fallen…

London's ruined economy has pushed everyone to the breaking point, and even the police rely on bribes and deals with criminals to survive. Detective Inspector Cass Jones struggles to keep integrity in the police force, but now, two gory cases will test his mettle. A gang hit goes wrong, leaving two schoolboys dead, and a serial killer calling himself the Man of Flies leaves a message on his victims saying “nothing is sacred.”

Then Cass' brother murders his own family before committing suicide. Cass doesn't believe his gentle brother did it. Yet when evidence emerges suggesting someone killed all three of them, a prime suspect is found -- Cass himself.

Common links emerge in all three cases, but while Cass is finding more questions than answers, the Man of Flies continues to kill...