A young provincial in search of adventure stumbles into the subterranean world of sadomasochism when he is implicated in a burglary of a Paris apartment. The apartment's mistress runs a two-floor operation, all respectability above and a dungeon of punishment-seeking clients below. After the young man becomes her upstairs lover, she finds that the two levels of her carefully controlled existence begin to interfere with each other. Barbet Schroeder's "Maîtresse" examines the line between fantasy and reality, decadence and deprivation, and the distance one will go for love.