assailant's left hand (which has Ingram's ring) is seen. Castanio investigates. Everyone hears Ingram playing the piano in the main hall, but when they go to check no one is there. Castanio witnesses Donald attacked and almost choked to death by the hand with Ingram's ring. He checks Ingram's coffin and finds that Ingram's left hand has been cut off, a hand-sized hole has been broken out of a window, and outside the hole is a trail of handprints. Castanio begins to believe Ingram's severed hand may have killed Duprex. Cummins sees the disembodied hand while working in the library. He grabs the hand and locks it in a desk drawer. When he summons Conrad and Holden to show them, the hand is gone, and they assume it to have been a figment of his imagination. Donald remembers the combination and location of a safe in the house, and Castanio and his father accompany him to the room where it is located. Inside is the disembodied hand. In a panic, Donald flees the house with Conrad in pursuit. Holden realizes that Cummins is the killer, having acted to safeguard his books, but his conscience is driving him mad, making him insist that the hand did it all. She urges him to turn himself in, promising to speak on his behalf. He instead tries to kill her to keep her from telling anyone else. To stay his hand, she claims to believe the hand is responsible, and begs Cummins to protect her from it. Completely convinced by his delusion, Cummins seizes the hand and throws it in the fire, but the burning hand crawls out and chokes him, fading out of existence after he collapses. Castanio and Conrad discover a hidden record player with a recording of Ingram's piano playing which Cummins remotely triggered from his desk. Castanio theorizes that Cummins cut off the hand, which he kept in his desk or the safe whenever not using it in an attack. Cast Robert Alda as Bruce Conrad Andrea King as Julie Holden Peter Lorre as Hilary Cummins Victor Francen as Francis Ingram J. Carrol Naish as Commissario Ovidio Castanio Charles Dingle as Raymond Arlington John Alvin as Donald Arlington David Hoffman as Duprex Barbara Brown as Mrs. Miller Patricia White as Clara William Edmunds as Antonio Belle Mitchell as Giovanna Ray Walker as Mr. Miller Pedro de Cordoba as Horatio Production