Nancy's mini mysteries

MINI MYSTERIES

A Nancy Drew Mini-Mystery: Nancy arrived at the scene of the crime, during the museum’s after-hours. A large ruby had been stolen from a glass display case, which was broken and the shattered glass scattered around the floor. Three people were crowded around it arguing. Nancy recognized each one of them: The security guard, a large man wearing large boots and had a jingly ring of keys around his belt, the janitor, wearing gloves and had left three large trash bags nearby, and a museum curator in a nice uniform. When questioned, the janitor claimed to have been upstairs cleaning, the curator claimed to have lightly dozed off at her desk in the office just down the hall, not hearing anything until the alarm went off, and the security guard claimed to have been patrolling the halls on the first floor, and he knew how many people were currently in the building. All three claimed to have heard the alarm go off and came running. Someone was lying about their story. Who was it?





A Nancy Drew Mini-Mystery: Nancy Drew arrived at the scene and heard the news of a double murder that occurred on a train. 
"The driver and the conductor were on the opposite ends of the train, but both were shot at the same time", reported a policeman who was at the center of the train at the time. The policeman had heard both gunshots at the same time. The train was travelling 150 kilometers per hour. Nancy Drew immediately realized that the driver and the conductor were not killed at the same time. How did Nancy come to that conclusion?

A Nancy Drew Mini-Mystery: Nancy, Bess, George, and Ned each had four clues given to them. They knew that they could only solve this if they worked together. What is the hidden message?