That night, Sarah led Sam to the top of the bookshelf. The airplane looked very far away. “We’re explorers, and good jumpers, too. We can do it!” Sarah said. Sam clenched his teeth and crept to the edge. “Follow me,” Sarah said, and then she jumped. Sam jumped, too, and climbed into the seat behind Sarah.“We’re off to see the world!” she cried. But just at that moment, the string that held up the airplane broke!