There are 4 books in the Zack and the Validators series.
The Zack and the Validators series does not have a new book coming out soon. The latest book, Spirit Bridge (Book 4), was published in October 2012.
The first book in the Zack and the Validators series, Zack's Point of View: Ants and Turnips, was published in February 2009.
The Zack and the Validators series primarily falls into the General Fiction genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.