Sold into a life of prostitution by her greedy uncle, innocent Gisella Trelain finds herself a prisoner in a dark and ominous dungeon. Chained to the wall is a muscular, naked man named Tristan who tells her he is under a curse. Every month he is doomed to lose his humanity and take on the characteristics of a ravening beast—a beast with needs too savage to be satisfied by any ordinary woman. In order to break the curse, Gisella must submit completely to the beast and offer herself freely to slake his fierce sexual desires. But the stakes are high in this fairytale come true and if Gisella isn't able to open herself completely to Tristan's lusts, she may lose her life as she attempts to tame the beast.