The Forest at the Edge of the World by Trish Mercer

Captain Perrin Shin and teacher Mahrree Peto have to unravel the secrets of the Guarders who attack their village. It's not as if the new Administrators are helping much. In fact, one might think Chairman Mal was behind it all. But that would mean the world was literally out to get them, and why would two inconsequential people in Edge be of interest to the Chairman of the world?