The story of one of the creepiest - and strangest - serial killers of the 20th century. Even before his arrest, the press nicknamed him “The Beast of Birkenshaw.” Peter Manuel was accused of killing at least seven people (there were probably many more). He became one of the last three criminals in Scotland to be executed by hanging... William Watt, accused of murdering his entire family, seeks to justify himself - and at the same time find out who really did it. Only one person knows the truth. His name is Peter Manuel, and he said he knew where the gun was used to shoot Watt's wife, daughter and sister-in-law. But Peter Manuel is a liar. And his lies can confuse anyone - even himself...