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In this third installment of MGM's "Dr. Kildare" series, Dr. James Kildare (Lew Ayres) comes to the rescue when his supervisor/mentor Dr. Gillespie (Lionel Barrymore) nearly collapses from overwork. Gillespie is seeking a permanent cure for pneumonia, and must ask Kildare for assistance when the task proves beyond his physical ability. The older doctor eventually does collapse, and the diagnosis is cancer. Gillespie recovers, while Kildare finds his hands full in juggling both the pneumonia cure and the case of a woman (Helen Gilbert) suffering from psychosomatic blindness. But what's the "secret" of Dr. Kildare? Well...that's a secret (until you see the film).