Captain Norman Craig, a war hero, returns suffering from a loss of memory sustained in an accident at the front. His sweetheart, Virginia Ames, anxiously accepts the advice of scientist Dr. Wayne Leveridge when he tells them that he has conceived a plan to restore the captain's memory. In actuality, the doctor is scheming to lure Virginia and the Ames jewels into his possession. The doctor suggests a fake robbery, but Craig pursues the thieves by plane, and in the ensuing struggle a blow to the head restores his memory. The doctor's motives thus exposed, the crooks are arrested and the captain finally remembers his sweetheart.