Although filmed by a joint German-Yugoslav crew, this European western is set in the Southern United States and involves an oddly-named hero, Old Shatterhand (Lex Barker of Tarzan fame). O.S. has a sidekick, Winnetou, an Apache chief played by a rather understated Pierre Brice. The fuel behind the drama is a hidden map that shows where a secret treasure is buried somewhere around Silver Lake. A gang of outlaws headed by Cornel Brinkley (Herbert Lom) is intent on retrieving the map and the treasure. Just as intent on stopping them are Old Shatterhand, Winnetou, and Fred Engel (Goetz George) whose father was killed by the outlaws' leader.