Near the end of World War II, Lieutenant Peter Roebling of German Military Intelligence offends a fanatical SS Colonel and rubs salt in the wound by defecting to the Allies to become a Nazi hunter. The SS officer takes a terrible revenge. Fast forward 30 years and the two men are locked in mortal combat in South America. There the Colonel lives incognito and Roebling, now working for the CIA, sets out on a mission to thwart a fascist plot in which the Nazi may be a player. Can veteran agent Peter Roebling and an amateur cadre of Christian activists derail the conspiracy? The answer lies at the end of a desperate journey up menacing tropical rivers.