London, 1952. The fog rolls in. It seems the Great Fog has claimed another victim--someone who most likely stumbled into the icy shallows of the Long Water. In fact, the floater is a biochemist who,only hours before his death, claimed to know something that could change the world.

The chase begins. Ex-spy turned Scotland Yard detective Herbert Smith thinks he left the shadows of espionage behind, until he traces the victim's final footsteps. They lead straight into the heart of a secret that is coveted by both the CIA and the KGB--and threatened by the last dangerous vestige of the Third Reich.