The mansion stood completely silent. Rain hammered against dark windows. Lady Catherine entered the library. Her scream pierced the air. Lord Pemberton lay sprawled dead. Blood pooled beneath his body. The letter opener protruded upward. His face showed pure terror. She backed away very slowly. The door slammed behind her. Someone else was definitely here. Heavy footsteps approached the door. "Nobody leaves," shouted Inspector Hayes. He had arrived too quickly. Catherine wondered who called him. The servants huddled together fearfully. The grandfather clock struck midnight. Everyone had clear, perfect alibis. Yet the body proved otherwise. This murder seemed simply impossible.