The loving couple of this grotesque parable parody of the Kádár-regime, Mária and István row to an uninhabited, idyllic island. Soon crazy tent-pitchers swarm to the island, led by an official representative of the regime.

This is the story of the water spider, which, unlike land spiders, does not weave its web in the corners of rooms or in the tops of trees or bushes, but in the water.

The unique statue of the ancient fertility goddess Demeter, known as the "Pagan Madonna" is stolen from the museum, located in a small town on Lake Balaton. At the same time seriously wounded a servant of the museum. The abduction of the museum's priceless statues of pure gold is investigated by the then young and inexperienced investigator Kardos and lieutenant "Droplet".