Jessica Barrett, wife and mother of two young children, begins to show signs of demonic possession while pregnant with her third child. As she seeks help from her husband and doctor, a mysterious man approaches her and seems to have some answers.

The son of Emperor Franz Josef of Austria, Crown Prince Rudolf, is believed to have shot his female lover and himself in a tragic suicide pact in 1882 in Mayerling. Due to Imperial cover-ups, the full story may never be known. This story has been filmed several times, in French in 1935 and in English in 1968. Hungarian director Miklos Jancso recreates those events for his own purposes, continuing his favored theme of the rejection of paternal authority. In the film, which has very little dialog, Rudolf is a good-natured pan-sexual golden boy, who cavorts on his rural estate with a host of beautiful, aristocratic lovers and friends of both sexes. He refuses to leave his country idyll even though he has been ordered to by the Emperor, his father. Despite the fact that for a large part of the film, attractive young people go about unclothed and engaging in erotic encounters, the mood is one of melancholy rather than prurience.