University student Jarda is still suffering his mummy's incessant, strict and loving care. One day the boy's cup of patience with his domineering mother overflows, he drops out of his studies, leaves home and finds a job at the post office. But mother finds him of course and is about to insist on her own way as usual. Jarda is unexpectedly helped out by the ghost of Mr. Kercl, a thief who had the bad luck to lose his life while trying to rob Jarda's mail-bag. Mr. Kercl's ghost helps Jarda several more times, but in exchange Jarda is to help him achieve definite entry into the land of the dead. But it is no simple matter to set right earthly sins and deserve eternal peace, and so they must both try really hard.