When the Big Bad Wolf comes knocking on the door of the Pig family, he finds himself surprised with a birthday party, and he forgets why he really came to see them.
Overseeing a "zoo-brary" that lends out all types of animals, librarian Miss Perkins discovers that the tiger has gone missing, a disappearance that triggers a citywide search alongside a new friend.
Molly and her brother Jake are two mice in search of the perfect home when they enter P.S. #42, but they soon discover that the school has as many dangers as wonders--including the ghost of a class pet.