Sins begins when John and his girlfriend Monika return to the ominous castle where he grew up as a Servant s son. John and Monika witness and encounter scorching sex action such as a dominatrix romp in the Hall of Mirrors, about atop the clock tower, a tumble in the grand old library, a rendezvous on the oak stairs, and a climatic 19-person masquerade orgy in the grand ball room.