Patagonia!

Three criminals, led by a certain Robertson, who claims to be Butch Cassidy's natural son, rob a bank in Esquel, Patagonia, and escape on Mister No's plane. Together with Parker, a strange journalist who is writing a book on the legendary bandit, Jerry sets out on their trail... Mister No and Parker follow the trail of the bandits through the places that saw the end of Butch Cassidy and are chased by the police, who believe them to be accomplices of the robbers. In Cassidy's old hideout, the game with the three criminals will end. But what is the secret of the mysterious Parker?