With Murphy's career on the line, his superiors give him one last chance: infiltrate a gang of diamond thieves whose heists have turned lethal. Murphy earns the trust of Terry, the unhinged leader, and gets caught up in a protection racket, robberies, and drug trafficking. Even worse, he's attracted to Terry's beautiful partner, who has secrets of her own.

Someone is seducing and murdering wealthy London businessmen. The victims all belong to an elite fitness club that's a hot spot for unfaithful spouses. Annie tells Murphy to pose as a high-flying banker, join the club, and start dating. Using his considerable charm, he finds scams, cheating husbands, and a string of beautiful suspects.