The mysterious Klamath Indians of Oregon treat those who are on the verge of death by delivering them to the care of the monstrous Sasquatch, the yeti of the North American forests, endowed with incredible thaumaturgical powers. But some of the members of the convoy of paleontologists guided by Tex and Tiger Jack see the giant beast as nothing more than a natural phenomenon requiring study… and to capture it they have no compunction about killing the chief of the tribe! The strange creature manages to get away thanks to Tex, but the revenge of the Klamaths – orphaned of their chief – is frightful! Innocent or guilty, the members of the expedition are all tied to the torture pole.