Ten-year-old Michael Fogg has no imagination, and when he sees a tiny being standing on the landing outside Flat 4, he needs to pinch himself. Flat 4 has been empty for as long as he can remember and the sight of a strange old woman scolding him and accusing him of misbehaving when she has never met him before gives him quite a shock. He puts it out of his mind, but the next time he presses the button to turn on the stair lights there is another visitor...