Inspector Glebsky arrives at the hotel "Dead Mountaineer's" because of an anonymous call. This hotel is located in a remote area in a valley, hidden among the mountains in some European country. The very name of the hotel - "Dead Mountaineer's" can be explained quite simply: one climber died here who fell off a cliff. He left only his faithful dog behind - a St. Bernard called Lel. In the hotel there is a rather bleak portrait of the climber near which faithful Lel likes to sleep.
Almost all of the lodgers are rather strange, especially Mr. and Mrs. Moses and Olaf Andvarafors. Later another strange individual materializes; Luarvik, who can not even utter a couple of words. Mr. Moses and Luarvik turn out to be aliens and Mrs. Moses and Olaf are their robots, although they look like ordinary people. And in the mountains they suffer a calamity.
