Eleven disparate adolescents, gathered for a skiing camp at an isolated winter resort, find themselves preyed upon and set against one another by their three mysterious instructors.
Two aliens stir up trouble on Earth in order to study humans. Misunderstandings ensue.
Captain Exner solves another detective mystery - this time while he's on vacation. The most elegant of Czech crime novelists has chosen a quiet town called Opolná as his place of well-deserved rest. But just as he arrives, the local shoemaker Rambousek, a famous (and wealthy) naive painter, is murdered.
