From the Inside Flap
Five year old Elizabeth, her brother Jason, who is ten, and their visiting cousin, Jasmine who is 11, meet with a supernatural being: the Little Devil. L.D. (as hes called for short) is an imp with horns, a tail and magical powers but, despite a wicked sense of humour, he seems harmless enough. As the children play the Little Devils games, L.D. brings a lot of good humoured mischief and some rather more alarming problems into their lives. Gradually the children are drawn into ever harder choices between what is right and what is wrong until, at last, they are forced to choose between conscience and the Little Devil himself.
From the Back Cover
The children had already been on holiday for a week and Elizabeth was bored. Jason and Jasmine didn't take much notice of her and all her friends seemed to be away. Elizabeth really wished that something exciting would happen; something unusual; something which would make her cousin and her brother pay more attention to her...