But the chair itself has other ideas. To the amazement and growing alarm of the family the discarded chair takes on a life of its own and Chair Person, as he calls himself, settles in as an uninvited guest. He speaks oddly and is terribly clumsy, but at first seems friendly, so that the children do their best to make him feel at home. But soon they regret their hospitality as Chair Person's behaviour gets worse and worse. His manners are appalling and his demands outrageous. No one seems able to control him. The whole family is plunged into chaos and the search for a solution becomes increasingly desperate - perhaps Auntie Christa will be able to help?