House of Stairs by William Sleator
Synopsis: Five orphan teens find themselves trapped in a room filled with nothing but stairs, which quickly turns into an experiment that may have no end. Review: House of Stairs is a book I read about a zillion times when I was a kid. The scenario enthralled me–a seemingly endless room with stairs as far as the eye can see, and a machine dispensing pellets of food as long as the kids performed a bizarrely elaborate dance. Things get darker when the machine changes its…