Shark's aviary

The ornithologist Hans Kuss has fallen in love with the sleeping car's porter Allan Shark. Both spend weekends in an empty dacha on a deserted island in the Baltic Sea. But Shark only seems to be playing with Kuss and does not return his deep feelings. When one night the owner of the house, Paul Gawitzki, shows up and wants to throw the two men out of his house, the situation escalates.