Kindergarten teacher Evgeniy Ivanovich Troshkin is reluctantly sent undercover to take the place of an imprisoned thief who stole Alexander the Great's helmet. Evgeniy uses his striking resemblance to the thief to infiltrate his gang and learn the location of the stolen artifact. He finds the gangsters are unexpectedly similar to his students- they also need love and care.
On a stopover in Moscow, a young writer Volodya makes friends with Kolya, who is returning home from a hard night shift. Just as Kolya is about to take a rest, he is met by his old friend Sasha, who wants help getting a deferral from military service so that he can get married.
A thief named Egor, having served a term in prison, goes to the country to meet his pen-friend Lyuba, a kind genial village woman. Egor comes to love Lyuba sincerely. Now he has friends, work and a beloved woman, he decides to break with his criminal past and start a new life. However, his former criminal associates interfere brutally.
