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As young doctor James Kildare and his finaceé, nurse Mary Lamont, make plans for their wedding day, Mary's brother Douglas arrives for a visit. Douglas meets with Dr. Kildare and asks him to arrange a meeting with wealthy Mr. Chanler, whose daughter Dr. Kildare saved some time ago, in order to solicit funding for subsidized trade schools. Soon after, the happy couple's optimism evaporates into despair when Douglas begins to hear nonexistent sounds and experience extreme mood swings, symptoms that lead Dr. Kildare to suspect that Douglas may have epilepsy, a hereditary condition that threatens his marriage to Mary. Dr. Kildare succeeds in getting Douglas an appointment with Chanler, but while Douglas meets with the philanthropist, Mary tells Dr. Kildare that her brother was kept awake all night by the sounds of a screaming woman, which confirms his suspicions about Douglas' epileptic symptoms and promts him to call Chanler and have him send Douglas to his office right away. The results of an experiment, in which Dr. Kildare administers coffee, whiskey, meat and salt to Douglas and lies to him in order to shock his nervous system, suggest that Dr. Kildare's assumption is correct. Dr. Kildare sadly admits that Douglas' prognosis is at best a lifetime of mediocrity and a complete mental breakdown at worst. As a result, Mary and Douglas plan to run away, but their flight is interrupted by the intervention of Dr. Gillespie, whose shrewd questioning of Douglas elicits the fact that he has suffered a recent head injury that might be responsible for the symptoms. When a further examination reveals a head trauma that can be remedied by a simple operation, the future again looks bright for Mary and her young doctor.