The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!

Hello, buffalo! That's what Jack and Annie say when the Magic Tree House whisks them and Teddy, the enchanted dog, back almost 200 years to the Great Plains. There they meet a Lakota boy who shows them how to hunt buffalo. But something goes wrong! Now they need to stop a thousand buffalo from stampeding!