Set in an opulent Italian castle, the film centers around a wealthy, bored aristocratic couple and their adult son. One night, they watch a mysterious and explicit silent film. The next day, while at a carnival, they encounter a beautiful woman who appears to be the actress from the film. They invite her back to their castle.

As the night unfolds, the line between reality and fantasy begins to blur. The guests and hosts engage in a series of psychological and erotic games, uncovering deep-seated desires and challenging their perceptions of truth, identity, and sexuality.