Fred Engel's father is murdered by Colonel Brinkley in order to acquire a treasure map, however the Colonel only acquires half of it, the other half as held by Mrs. Butler. Discovering the scene of the crime, Old Shatterhand and Winnetou help Fred bring his father's murderer to justice and locate the treasure of Silver Lake.

Strange fortune hunters are behind a girl's murder in this Edgar Wallace tale.

Ten strangers are invited as weekend guests to a remote mountain mansion. When the host doesn't show up, the guests start dying, one by one.