Cross is an old hand at the CIA, in charge of assassinating high-ranking foreign personalities who are an obstacle to the policies of the USA. He often teams up with Frenchman Jean Laurier, alias Scorpio, a gifted free-lance operative. One day, the CIA orders Scorpio to eliminate Cross -- and leaves him no choice but to obey. Scorpio is cold-blooded and very systematic; however, as a veteran agent, Cross knows many tricks. He can also rely upon a network of unusual personal contacts, some dating back to the troubled years preceding WWII.