The usual life of bank employee Serov collapses overnight. He learns about an incurable disease, loses his job, and an expensive operation is needed to save his daughter. And Serov turns into the mysterious Doctor. His goal is to earn big money and punish his enemies. He invents counterfeits for ATMs, organizes their risky sales, confronts criminals, and leads investigators by the nose. But where there is big money, there are always big problems. Will the Doctor cope with them?