"The roommate is the ideal woman!"
So says Don Elemirio, a Spanish grandee who lives like a hermit in his luxurious Parisian mansion. His rules for sharing his space are simple: never set foot in the forbidden dark room. Saturnine Puissant is looking for a room to rent. Independent, cultured, and brilliant, she doesn't know what to make of this rich, eccentric landlord, but she can’t help wondering what happened to his eight previous roommates. Did they break his rule? Saturnine will have to avoid his traps and manipulate her manipulator.