Jean is approached by two men who want him to guide them up Mount Weisshorn. Knowing how tricky and dangerous the journey would be in cold weather, Jean refuses.

Angered, the men, who are actually baddies posing as tourists, dognap Gruff and blackmail Bobbie into cooperating. Back home, Bobbie's disappearance has not gone unnoticed by Jean, who recalls having met the men before.