A young Bulgarian inspector Georgiev is in Warsaw to lead an operation to defraud and capture a Dutch-based gang leader involved in currency crimes. To accomplish this task, he needs to use Jeanne as a "decoy duck". She's Bulgarian, married to a gang member.

Denev is a specialist in his area. and has no time to write his dissertation. His cousin Ivan offers his help to switch places wich leeds to catostrophe.

Boev, an enthusiastic form master, is trying hard to establish rapport with his final-year students. His frankness, buoyancy and good nature soon make him a universal favorite. The only one who does not approve of him is headmaster who loves his job, but is not aware of how dated his own views are and cannot understand the young teacher. Apart from this, Boev comes in into particularly sharp conflict with his colleague and childhood chum Kiril who is consumed by jealousy and the ambition to get promoted quickly.

Who says that cats and dogs are enemies? The dog Spass and the cat Nelly live happily under one roof. The harmony lasts until once, enraptured with games, they ruin the apartment.