Trouble does not come alone. After serving three years in prison, Andrei Porubov returns to his hometown. There, sad news awaits him - his mother, his only close and dear person, is seriously ill. She requires expensive heart surgery. Where can you get such huge money? His classmates rush to Andrey's aid. The three of them pull off a complex adventure and eventually get the required amount. And along the way, they punish dangerous criminals and once again test the strength of their friendship, sealed by courage, nobility and selflessness...