 A Spanish police chief (Max von Sydow) hires an undercover agent (Jorge Rivero playing a Jewish mercernary(?)) to infiltrate a gang of heroin smugglers. The mercernary is code-named Eagle because of a tattoo. Infiltrating the gang, he uses a female agent (Maud Adams) as a point of contact. However, as he gets deeper into the gang, he discovers that there bigger goings-on than dope. The gang is involved in the transportation of smuggled uranium for the manufacture of nuclear arms for sale to Libya and other aspiring third world countries. Things get even stickier when a ruthless bad guy (George Peppard) shows up and he turns out to be one of Eagle s former cohorts in the Foreign Legion.