Based on the classical novel "Treasure of Silver Lake" by Karl May. Cowboys Hobble Frank and Tante Droll are instructed to deliver the legacy of chief Weiser Bär, a map to the legendary Treasure of the Silver Lake, to his heirs Großer Bär and Kleiner Bär. But the bandit Cornel Brinkley and his gang manage to steal the map, prompting Frank and Droll to enlist Old Shatterhand and Winnetou to help them recapture the map and save the treasure.