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

The magic treehouse whisks Jack and Annie back to the days of deserted islands, secret maps, hidden gold, and nasty pirates.

Travel with Jack and Annie to the deep, dark ocean to encounter the stealthiest of underwater predators: the shark! Jack and Annie are going on vacation! Or so

Eight-year-old Jack and his younger sister Annie find a magic treehouse, which whisks them back to an ancient time zone where they see live dinosaurs.