A celebrated adventurer ("Capt. Spaulding" – Groucho Marx) makes his way back from an African expedition and finds himself the guest of honor at a grand party. During this elegant gathering, a priceless painting disappears, prompting him and his companions, Harpo, Chico & Zeppo, to assist their hostess—the sophisticated yet practical "Mrs. Rittenhouse" (Margaret Dumont – who often seems unable to maintain composure a…