Jack tore the star map out of his notebook. He placed it on the M, next to the mammoth bone, the mango, and the moonstone. He sighed, then sat back on his heels. “Hand me the Pennsylvania book,” he said. They needed the Pennsylvania book to get back home. They was silence. Jack turned and looked at Annie. “It’s not working, Jack,” she said. “The book’s not here.” “What?” was the map the wrong thing? They looked around tree house. “It’s definitely not here,” said Annie. “Oh, no.” Jack’s heart sank. He picked up the star map and stared at it. Squeak’ squeak. Peanut jumped out of the letter M. “I’ve got an idea,” said Jack. He reached into pack and took out his pencil