Sadistic London gang leader Vic Dakin's (Richard Burton) character is based on the original real life gangster Ronnie Kray. Vic becomes worried about a potential police informer that could bring him down in his criminal empire. His downfall comes however in him moving from his protection racket into armed robbery, where he plans a payroll robbery and directs the blackmailing of Members of Parliament with a taste for unorthodox sex. Scotland Yard police Inspector Matthews is moving in on the gang and approaches the hospitalised gang member Frank for a confession. Will Frank confess all before Vic can silence him?