The son of a miller, following his call, flees to the sea, but after several years he returns to his family and to his childhood romance, Hanka.

Ryszard Malewicz, a young inventor, is out of work. He had been waiting for months for a response from the ministry to which he had sent plans for his invention, an explosive of extraordinary power. Desperate Ryszard is comforted by his mother and his fiancée Maria.