British police detective Tom Carver investigates what he believes to be a run-of-the-mill murder of a vagrant. As he works the case, however, he learns that the murdered man was a banker who was moonlighting as a black-mailer with ties to Maxamillion Snider, the head of a nefarious crime organization. The murder victim had stolen a top-secret disc for Snider with information about the government's attempts to manufacture a battlefield nerve gas agent. When he refuse to drop the murder case investigation, Carver is framed by members of his own force who are in league with Snider. Soon he's on the run from the police, security Services and Snider's hit men—and even his estranged family is threatened. Can Carver get Snider before the nerve agent is released throughout London?