Bill Hartford is a successful New York doctor — wealthy, comfortable, socially connected, with a beautiful wife Alice and a comfortable Upper West Side apartment. At a Christmas party hosted by one of his patients — the enormously wealthy Victor Ziegler — Bill moves through a world of effortless privilege. Beautiful women approach him. Ziegler treats him as an intimate. The world is pleasant and predictable.
That night, Alice reveals something that shatters Bill's comfortable picture of their marriage: she once came close to leaving him for a naval officer she had seen for a single afternoon — a man she had never spoken to, whose desire she had felt so completely that she was prepared to abandon everything for him. The confession is not about infidelity. It is about the existence of a desire that Bill had not imagined — a reality beneath the surface of their domestic life that he had been entirely unaware of.
Bill's subsequent night journey through New York — driven by a disoriented mixture of jealousy, desire, and compulsion — leads him eventually to a masked ritual at a country mansion. What he witnesses there: an elaborate sexual-ritual ceremony attended by the city's social and financial elite, presided over by a robed figure, conducted behind a password that Bill obtains by accident and uses without understanding what he is entering. He is discovered. He is warned. And he returns to his ordinary life — apparently unchanged, apparently unharmed — to find that the world he thought he knew has been quietly, efficiently managed around him.