The idyll of Blandings Castle is about to be disturbed, for the Hon. Freddie Threepwood is poised to make his debut as a jewel thief. Freddie, however, is not alone: Blandings is simply brimming with criminals and impostors all intent on stealing Aunt Constance's 20,000 pound diamond necklace. It is left to the debonair Psmith, with his usual aplomb, to unscramble the passion, problems, and identities, of one and all.