Inspector Duval flies to South America to collect Dave Carson and take him to stand trial - and lands in the middle of a civil war. Told that Carson is working at a pumping station on an oil pipeline, Duval risks the fighting to go there with Captain Garetta of the local police and finds Carson alone, insisting he must stay to repair a damaged valve - or face oil flooding a valley. Duval decides to trust Carson and helps him in his work, but discovers he cannot rely on Garetta - working for the revolution, he has his own plans for Carson and Duval.