Lucie Rýdlová is found dead at a destroyed car after a night accident. The seat position shows that she cannot have been driving, and the dissection proves that she had died about four hours after the accident. It is for sure that a timely medical assistance could have saved her life. A pretty young tennis player Lucie lived at her grandmother, because her parents had been working abroad. Criminalists found out that the girl was going out with the interpreter Valenta (Eduard Cupák), who was twenty years older than her, divorced and a bit egoistic man.
There are still water spirits among us. One group lives in Prague, led by Mr. Wassermann, who is using his wife's family as a servants. All they need is their old house near the river. But the house is to be demolished. They have to stop it. And the only way is to drown Dr. Mrácek, who is responsible for the demolition. But he falls in love with Wassermann's niece Jana. He changes to fish, is mistaken for water spirit from Germany, is drowned and revived again. The other problem is the flour with ears... and so on...
