In season 4, Sana Kuchin will have to again bail out absent-minded relatives and friends, and at the same time graduate from the FSB Academy. Having asked off for a day in his hometown, the guy learns that life without him has changed not for the better: his brother and his family are forced to live on the street, Lenka did not return from Armenia, her parents divorced, and Crane in general let the rumor about the death of Sanka. The patriot is left to restore order and solve the problems of his relatives and his hometown.