Praskovya Ivanovna works as a postman, helps everyone who needs her. Pasha, finding himself in the hospital, accidentally meets Grigory. She will soon be discharged, but she, sympathizing with him, continues to visit her new acquaintance. A friendship began. But then one day Grigory turns to her with a strange request, to go to his home on an overnight boat and see if his wife is cheating on him...