Having spent seven years in a secure psychiatric unit, taunting his next-door neighbour, Dermott Madison is devastated when Abdul Hamid, the rapist and murderer of his wife and daughter, is released.
When Dermott and his alter egos, Norman and Albert, are eventually set free themselves, all hell breaks loose. The thirst for revenge has never been stronger, and the rage, never more dangerous.
But the rage isn't the only problem they face. Scotland Yard detectives, led by Liz Porteous, are closer than ever to catching the Facebook Killer ... and his "friends".