With London gearing up to host the Olympics, the city doesn't need a serial killer stalking the streets, but they've got one anyway.
Leaving a trail of brutal and bizarre murders, the police force is no closer to finding the latest psychopath than Detective Inspector Kurt Lancer is in finding a solution for his daughter's disability.
Thrust into the pressure cooker of a high profile case, the struggling single parent is wound tight as he tries to balance care of his own family with the safety of a growing population of potential victims.
One of whom could be his own daughter.
Fingers point in every direction as the public relations nightmare grows, and Lancer's only answer comes in the form of a single oak leaf left at each crime scene.