On their eighteenth birthday, Monica and Susan, beautiful and desirable twins, plan to escape the oppressive grip of their adoptive parents, General Mendez and his wife, Rosario. The twins dream of fleeing to Europe to break free from the rigid discipline and constant sexual harassment they endure at home.

But the General and his wife have their own sinister plans. For years, they have prepared a basement room filled with instruments of torture and humiliation, ready to transform the twins into objects of their darkest desires. The night after their party, the girls awaken in this nightmarish dungeon, bound and at the mercy of their sadistic captors. As the General takes Monica to fulfill his twisted fantasies, Rosario focuses her cruel intentions on breaking Susan into a submissive slave. What was meant to be a day of freedom becomes a descent into terror and depravity.