Something Upstairs (also published as Something Upstairs: A Tale of Ghosts) is a young adult historical thriller fiction novel written by Avi first published in 1988. It concerns a 12-year-old boy named Kenny Huldorf who has moved to a new area and discovers a ghost, Caleb, in a room. Caleb was the slave of a previous owner of the home, and is stuck there until someone can help set him free. Kenny travels back in time with Caleb to find his murderer and comes to a dilemma on whether he can return to the present or save his new friend. The novel has won several awards in children's writing.