In the absence of their parents, the Malinowski kids are robbed. Instead of going to the police though they decide to regain the stolen money themselves.

Mr. Samochodzik with his friend Joanna and her son Piotr are going on vacation to a mountain village. Peter dreams of adventures, and his imagination is focused on discovering weirdness. Here he eavesdrops on a conversation which shows that a man and a woman are planning a murder. It turns out, however, that the mysterious man is the author of crime novels Mr. Arizona, who uses the advice and ideas of his servant Sophia. The mistake is explained, Mr. Samochodzik, Joanna and Piotr gain new friends and thanks to them they meet the Italian film crew making the film in this area. Unfortunately, a real misfortune falls on the filmmakers: the main role star - beautiful Diana - mysteriously disappears. There is a break in shooting. The producer of the film seems distraught, but Mr. Arizona suspects that the actress's disappearance is an advertising gimmick. The friends start investigating on their own.