The history teacher Aleksandr Lvov is happily married to Anna, a woman with a child. His adopted son, 8-year-old Vanka, has long become Aleksandr's family. But now paratrooper Vadim Kotov, who served under the contract, Anna's ex-husband and Vanka's father, is returning from the army. He wants his son back. Men have a serious conflict but when their son kidnapped gangsters by mistake instead of son of rich father they unite in case for save kid.