John Kidley, a multi-millionaire hypochondriac, spends what he believes are his dying days at the health spa at Bad Gaswasser, slowly digesting himself to death because a chemist has gotten his stomach acidity report mixed up with that of a dog. Kidley barely escapes marriage to the murderous adventuress Juno Markoff when he meets Mickey Hawkins, a Texas heiress whose father has promised her hand to the fortune hunting Prince Smirnow. When Kidley learns that Mickey is eating her heart out over Henry Munch, a bus driver from back home, he suggests that the answer to both their problems is to marry each other. Complications arise when Henry appears to accompany the newlyweds on their honeymoon, and Juno and Smirnow, blaming Kidley for cheating them out of their fortunes, set out to claim their rightful due. After Kidley eliminates Smirnow in a duel, Henry shows up engaged to Juno, and Kidley begins a new, healthy life with Mickey.