The wife of a south-London villain is brutally beaten and then murdered. Eyewitnesses identify her lover Tony Simpson, as the murderer. Simpson reads in the morning paper of the police hunt for him, but after a night of heavy drinking he suffers from amnesia and has no alibi. His wife refuses support and he must seek shelter with friends. Soon he discovers a devious plot to frame him, and he finds out that a look-alike is impersonating him. Knowing that the police would not believe him, he sets out to find the murderer himself. His best friend, the victim's husband, sets a trap for him but he manages to escape it. Then one of the young women sheltering him is also murdered and the other one attacked, left for dead and the police are convinced Simpson is their man. Simpson concerned about his friends' safety gives himself up and is charged with murder. In the meantime the killings go on but because the modus operandi is different in each case, the police do not link them up. Despite overwhelming evidence against him, the truth at last emerges during an Old Bailey trial and puts a twist in the tale.