At the home of Lord Caterham and his daughter, Lady Eileen Brent (aka Bundle), Sir Oswald and Lady Maria Coote throw a party for some weekend guests. But the young guests play a practical joke on someone who turns up murdered the following morning. It's up to Bundle and her friends to solve the case, which only gets worse with the appearance of a second corpse. The trail of bodies leads to the mysterious Seven Dials Club.