Stepa and his friends find Yesaul Govor in captivity by the Poles, who are preparing to hang him. Nazar manages to convince everyone that Stepa is a Polish spy and he is in danger again, now from the Cossacks themselves.

Stepa is trying to disrupt Alyonka's wedding with Nazar, he has proof that there is a Polish spy among the Cossacks. And now Stepa, along with Ivan and Nikita, will have to pass the tests to become a real Cossack and get the right to go to the battle for Moscow. But the guys decide otherwise.

Stepa and Alyona go after the Cossack detachment. But the chieftain refuses to let Stepan into battle. Stepa does not obey and meets Nazar on the battlefield in a decisive battle.