A woman lived in a round house with her son, butler, maid and cook.
One day the woman heard a scream and ran out to see what it was. It was her child. He was dead on the floor. The cops came to see what had happened.
The woman said she was taking a shower, the butler said he was setting the table. The maid said she was dusting the corners. And the cook said he was cooking dinner.
Who killed the woman’s son?