Three executives attended a breakfast meeting. A pot of coffee was served. Two drank their coffee immediately and were fine. The third waited 20 minutes before drinking and died. All three cups came from the same pot. The detective immediately knew the third executive had been murdered. How?
A woman was found dead in her study. The door was locked from the inside, the windows were sealed shut, and she was alone. A half-finished glass of water sat on her desk. There was no sign of forced entry and no secret passages. The detective concluded it was murder, not suicide. What was the murder weapon?
Mr. Hayes claimed he could not have committed the robbery because he was on the 8:15 train from London to Edinburgh when it occurred at 9:00 AM. The train ticket confirmed his booking. The detective arrested him anyway. Why did the detective not believe the alibi?
