In Edwardian London, George Harvey Bone, a talented but troubled composer, finds himself experiencing blackouts during which he cannot recall his actions. After one such blackout, he realizes he may have committed a murder. As Bone struggles with his dual nature and the uncertainty of his own mind, he forms a relationship with a beautiful, ambitious singer named Netta Longdon, who cunningly manipulates his feelings to further her own career.

Simultaneously, Dr. Allan Middleton, a psychiatrist and family friend, becomes increasingly concerned about Bone's mental state and potential for violence. As events spiral out of control, Bone's grip on reality weakens, leading him down a dangerous path. Amidst the growing tension and mistrust, the true extent of his psychological distress gradually comes to light, leaving those around him to uncover the dark truth behind his actions.