Yvonne De Carlo stars as a spy for the French Foreign Legion in Algiers. She poses as a cabaret singer to try and expose an Arab rebel leader (Raymond Burr) who is suspected of starting an uprising to control the oil fields. She successfully cozies up to him in his palace, where she gets the information. But he finds out that she is a spy. Now the only chance she has is her real lover, a soldier (Carlos Thompson) in the French Foreign Legion.