The Secret of Two-Edge by Wendy Pini,Richard Pini Summary
Within the corridors of Blue Mountain, Winnowill has hatched her most ambitious plan ever -- to take her people away from the World of Two Moons and back to the stars. To accomplish this, she must be rid of the Wolfriders. As her human slaves and Cutter's tribe fights for its survival. Winnowill prepares her final, mind-boggling assault.