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

On the front of the book jacket, the word "mad" in the title is upside-down and backwards.

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

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

Discover the true genius behind history's greatest "madmen". From Dr. Frankenstein to Dr. Jekyll, the image of the mad scientist surrounded by glass vials, copp