Claire Martin, a diligent American art student studying in Paris, suffers a blow to her head that transforms her into a woman of questionable morals. She then becomes involved with Scott Houghton, an unscrupulous artist who paints a suggestive portrait of her. When Houghton attempts to seduce Claire, she resists and in the struggle strikes her head and is restored to her former personality. Claire returns to America with no recollection of her lurid life, but when she meets Houghton at a party, he promises to illuminate her past. He lures Claire to his hotel room where his nephew stabs and kills him. The violence traumatizes Claire, who believes that she perpetrated the crime. When Houghton's nephew confesses, Claire is cleared of the crime and her seedy past and is free to marry her sweetheart Howard Kent.