Going up!

"Sophie and her dad have been invited to their neighbor Olive's birthday party, on the tenth floor of their apartment building. They bake cookies, which they put on a special platter, and then head to the elevator. At each floor, the elevator stops to let in other party guests. Along the way up, the elevator gets more and more crowded as a diverse cast of neighbors squeeze in. What will be waiting when the elevator reaches the tenth floor?"--Publisher.