The 1940s; civilisation is plunged into the evil darkness of the most terrible of wars. Under cover of night, blackouts and Blitzkrieg, the strangest and most violent murderers humanity has yet seen slip through the shadows, leaving a bloody heritage that continues to shock and amaze today. Meet Gordon Cummins, London's "Blackout Ripper"; John George Haigh, the acid bath murderer; Ray Fernandez and Martha Beck, America's Lonely Hearts killers; William Heirens of Chicago who scrawled on the wall above one of his victims "For God's sake catch me before I kill more..."