Now, I know that some of you are wondering just what exactly I mean by "multi-platform book phenomenon". I'm referring to the current craze in tween literature where a series (1) publishes a new title every three months, (2) rotates writing responsibilities among popular authors, and (3) expands the experience through an online game. The 39 Clues series established the trend; Spirit Animals continues it. In the realm of Erdas, every child who comes of age must discover in they have a spirit animal bond, a rare link that conveys incredible power. The first title, Wild Born by Brandon Mull (author of both the Fablehaven and Beyonders series), debuted today, September 10, 2013.