Old houses in Zagreb are destroyed in order to build new, bigger blocks. A teacher who lives in one of these houses allows a stranger to share his home with him. The stranger has a fascination with statistics, and claims he can predict crimes based on statistical analyses. When a predicted murder did not occur, the stranger is adamant that the whole town will suffer unless a balance is achieved - and he leaves.
Pajo is a hardworking, lonely but also very rich farmer. His son Toma was, however, bored with country life and tried to seek fortune in the city. Short on money, Toma returns to the farm for a handout while Pajo tries to convince him to stay.
A poor writer discovers that a species of rats has banded together to impersonate humans and supplant them unnoticed, in a manner reminiscent of the transformations in Eugene Ionesco's Rhinoceros, or the covert conspiracy of pod-people in The Invasion of the Body Snatchers. This film's story is based on a book by the Soviet writer Alexander Grin.
