In her fantasies, an ancient, unspeakable thing slumbers in the muck at the bottom of the abandoned pool. In her fantasies - erotic, masochistic, and full of violence - masked strangers capture, beat, and bind a trio of brave, beautiful women, exposing them to creatures that penetrate, control, and devour them. Are these just the fetishistic nightmares of one haunted woman's subconscious? Or is there really something at the bottom of the pool?

The beautiful O is taken by her boyfriend, Rene, to a bizarre retreat, where she is trained in bondage and sexual perversion. Rene discharges a personal debt by transferring possession of O to his step-brother, Sir Stephen...

The daughter of a wealthy real estate broker falls in love with a younger man, who introduces her to B&D and S&M. Using her newly awakened sexual prowess, she finally takes charge of her own life.