K - the Unknown on AllMovie

Sidney Page (Virginia Valli) is studying to be a nurse. All the young men are in love with her in the small town where she lives, but she becomes fascinated with K. LeMoyne (Percy Marmont), the mysterious stranger who moves into the boarding house belonging to her Aunt Harriet (Myrtle Vane). Sidney's attention is distracted by yet another handsome stranger who comes to her town -- Dr. Max Wilson (John Roche). Although he wins Sidney, Wilson is also seeing his nurse, Carlotta Harrison (Margarita Fisher). When Wilson and Carlotta head for a nearby inn, one of Sidney's other beaus, George Benson (Francis Feeney), shoots him. LeMoyne, it turns out, is Dr. Edwardes, noted surgeon who is in hiding after being accused of manslaughter. Carlotta convinces him to operate on Wilson to save his life. Sidney is impressed by LeMoyne's sacrifice -- he is arrested for the old charge after revealing his identity. When Carlotta confesses on the stand that she was responsible for the deaths, not Edwardes, he is acquitted and he marries Sidney.