Having married a poor girl, the moneylender tries to take out his anger for the injustices he has suffered in life on the helpless orphan, hoping that she will live meekly, constantly begging for his noble soul. However, Anna enters into an irreconcilable moral battle with her husband...

People living at a seashore town are frightened by reports of an unknown creature called "the sea devil". Nobody knows what it is, but it's really the son of doctor Salvator. The doctor performed surgery on his son and now young Ichtiander can live under water. This gives him certain advantages, but also creates a lot of problems.