A mysterious tomb is unearthed in the catacombs under Rome, the contents of which contain evidence of an ageless evil that may once have preyed on man.

Distressed that her wayward husband, Gianni (Alberto Lionello), forsakes her favors and seduces a series of other women, drop-dead gorgeous Gioia (Edwige Fenech) turns to handsome lothario Patrizio (Ray Lovelock)…