Silas Blackburn is killed on the day before he intended to remove his grandson from his will. For some strange reason he decided to sleep where many of his family have died in agony and he is found dead in this locked and abandoned room. How did someone get in? And who did it? The detectives who show up to investigate the case suspect any number of characters, including the grandson who has no memory of what he did that night but who was in the area.