The Alster Case

Miss Cornelia Alster, a wealthy spinster, secretly makes George Swan, a poor lawyer's clerk, executor of her estate. That night, she goes to a theatre and returns home unexpectedly, discovers her two wards, Beatrice and Linda, in what she thinks is an affair with two men. As a matter of fact, Linda is fighting Keith, the butler, who is using some knowledge of her to force her to give him money. Beatrice is entertaining her sweetheart, Allen Longstreet, a young inventor. Miss Alster waits in her room, determined to see who the men are. The next day she is found murdered. Trask, a noted detective, is put on the trail. He runs down five clues, the last leading to the criminal. It is a baffling story and an unexpected denouement. The criminal is in the cast. Which one do you think committed the crime?