Seriously ill, concert pianist Karen Duncan is admitted to a Swiss sanitorium. Despite being attracted to Dr Tony Stanton she ignores his warnings of possibly fatal consequences unless she rests completely. Rather, she opts for a livelier time in Monte Carlo with dashing Paul Clermont.

An elderly Catherine de Medici reflects back on how the prophecies of Nostradamus accurately predicted the fates of her husband, her three sons and herself.

Leopold Kroner, formerly of Colby Enterprises, is released after five years in prison for embezzlement. Andrew Colby, claiming that Kroner has threatened him, hires lawyer Bob Regan as a secret bodyguard. Sure enough, Kroner turns up in Colby's room with a gun, and Regan kills him. Then Regan, who sticks around to romance Colby's secretary Noel, begins to suspect he's been used.