The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! No girls allowed at the Olympic Games! That's the rule when the Magic Tree House whisks Jack and Annie back to ancient Greece. But when Annie tells jack to go to the games without her, he knows she's up to something. Will Annie find a way to see the games? Or will she get herselfand Jackinto Olympic-size trouble? Find out in Hour of the Olympics. Did you know that there's a Magic Tree House book for every kid?