Marty Onster might be a monster—but he still knows to play it safe on Breakneck Hill. When Bart Ully and his friends dare Marty to sled over the jump at the bottom, will Marty stay smart? Or will Marty and Sally Weet’s snow day end in an accident? Looking Glass Library is an imprint of Magic Wagon, a division of ABDO Group. Grades PreK-4.