Joe Ederer is a sassy, hard-bitten, fast-talking American who has violent nightmares about his murder. He has arrived in London determined to win back his British fiancee. Three problems stand in his way: a suffocating sexual relationship with another woman; his fiancee's boyfriend, a cheating rat; the threat to his life hanging over him like the Sword of Damocles. Then, he buys a gun and meets a Parisian siren and everything comes into focus.