The Terrible Bedtime Tales of Mr. Gruber, Paperback

4 kids stumble upon an artifact that gives them the ability to travel from place to place in an instant. They enjoy the advantages of this mystical object until they realize someone else wants it back and will do anything to get it. The Terrible Bedtime Tales of Mr. Gruber is based on stories told by the author to his children over the course of more than a year. The children must use their imagination and wits to stay one step ahead of the creepy and mysterious Mr. Gruber