Eighteen-year-old Clare Timms, desperate to earn money to help support her guardian Sarah, and stop them both being evicted from their cottage, goes to Breakheart Hall to plead with their landlord: the masterful Lucas Tolliver. To her amazement she is given the chance to save their home if she agrees to serve as a "Hall Pet". These are a secret stable of naked female sexual submissives and playthings, who are provided for the entertainment of both the Tolliver clan and the exclusive attendees of the many conferences and seminars they host at the Hall. Clare is given the pet name of "Swallow" and is initiated into the world of BDSM sexual submission.
Clare knows that she must at all costs keep the secret of the Hall and her true work there from Sarah. Unknown to Clare, however, Sarah is being blackmailed by a young man named Redwood, who has intimate pictures of Clare that he says could cause her to lose her job and get them evicted. In return for his discretion, Sarah must submit to degrading and painful sexual acts.
At the Hall, Clare is tended to by her own sexual valet, who puts her into a collar and harness. She is taught how to give fellatio and cunnilingus; gets restrained, spanked and screwed on a sex rack: is put on naked display at a dinner party where she also dances on ice; endures sex on a bondage bed; gets bound and lashed outdoors; plays the part of a living naked target for paintball trap shooting; serves a couple in a gauntlet frame; does a spot of naked housework with intimately inserted accessories; gets lashed in a body press; entertains naked at a garden party, and is stalked through a maze by three men who subject her to a rough gang-bang.
Yet, after her initial revulsion, Clare gradually finds that these strange and perverse sexual encounters, even the crueller ones, are awakening unexpected dark desires within her, and she experiences many intense orgasms. Sarah also seems to be getting surprising pleasure from her clandestine BDSM sessions with Redwood. Then, just when it seemed things could not get any stranger for the two women, they fall into the clutches of the sinister "Mr Pitch".
