Monseiur Pamplemousse has been summoned by the director of Le Guide, the prestigious culinary magazine for which Pamplemousse writes restaurant reviews. The aunt of the director's wife, whose restaurant perpetrates some of the worst food in France, is demanding to be included in the next issue. With the director's marriage at stake, he dispatches Pamplemousse to the Hotel du Paradis. There, Pamplemousse meets Aunt Louise, who serves him a dinner that causes his gorge to rise . . . and other things as well, for the meal contains an aphrodisiac of undeniable potency. Who would do such a thing? And why?