Masha, preparing for admission to the pedagogical institute, decided to work as a counselor at a pioneer camp...

To Moscow have arrived the participants of the international conference of the zoophilologists and also the international jury which is to elect for the world festival the best performance of the program of Moscow circus. Mrs Whistler (Iva Janzurová), British associate professor, makes her understood with the animals in their language but the Czech professor Ruzicka (Jirí Sovák), though he is capable of using the animals language, prefers teaching the animals the human language. Ruzicka's friend, the poodle Archibald, speaks "in Human" very well. The scientific dispute ends with a bet - if Ruzicka teaches the circus elephant to sing, Mrs Whistler will eat up her hat.

Far Eastern policeman Serezhkin, the hero of the movies "The Master of the Taiga" and "The Missing Witness", is now a captain. This time he investigates a complex case of missing rafts with wood, about the fight loggers with foreman Chubatov and a fire at the timber warehouse. All three cases are in one bundle: the intruders are trying to blame everything on the foreman. But Serezhkin is an experienced detective to figure it all out and save an honest man from prison.

Multiply love stories are going around the young family including the newlyweds parnts and even... a grandmother.

The film is a reflection on the responsibility of man to other people, native nature and the world around us, the problem of preserving Lake Baikal, on the banks of which a large construction project has unfolded. The first half of the 60s of the XX century, the story of the love of young Lena Barmina to an adult respectable person, bearing on his shoulders a heavy burden of responsibility for the activities of a huge enterprise. Construction engineer Chernykh and Lena, the daughter of a scientist, are doing everything to save the lake from harmful and unjustified plums. A difficult relationship develops between them and soon Lena realizes that she is in love. But after learning that Chernykh is married, the girl leaves...

Five pensioners, former highly skilled workers, decided to assemble a cross-country bus from cars that had been wrecked during tests. When the all-terrain vehicle was almost ready, their brainchild was in danger of being scrapped - and then the old men stood up to defend it.

A band arrives late at the competition. They try to find the jury and show their performance.

In the years following the end of WWII, test pilots and designers risk their lives to master new jet technologies.

A young girl Marina suddenly meets an evil witch so adventures start...