Who can solve the mystery?
Alec Crabtree was found dead at his desk in his study last night. He had been hit on the head with a blunt object. He had been sitting at the desk with his back to the door, and was in the middle of writing a letter. He was found by his wife, when she went in to bring him his bedtime cocoa at 11:15pm but his watch, which had been smashed in the struggle, had stopped at 11:05pm. The suspects are the people who were in the house at the time: Mrs. Crabtree (the dead man's wife), Daniel Crabtree (the dead man's brother), Mr. and Mrs. Fairfax (old friends of the Crabtrees), and Susie (the maid).

The murderer was Mrs. Crabtree because:
She was wearing red, and they found a piece of red material on the window. Everybody smokes except Mr. Crabtree and the maid, and a cigarette end was found near the body.
Mrs. Crabtree’s name is not Alice and she had a note in her purse saying Alice was waiting for her husband outside and it joust happens that Mrs. Fairfax’s name is Alice.
She and Susie were the only ones that weren’t watching T.V. with the guests, but
Susie was washing the kitchen.
The window was open. No one saw Mrs. Crabtree go outside but she came in through the front door.
The silver vase missing from the room, the weapon she used, was found in a flowerbed outside. She must have thrown it when she made her perfect exit through the window. Then she went into the kitchen and started to make cocoa fot herself and her husband. When she went to serve the cocoa to her husband she “discovered” him.
Case Closed!