They are called the Bird Spirits by the humans. Each night the humans worship them and leave them food as an offering. But Cutter and the Wolfriders know the Bird Spirits are not gods, or even spirits. They are real. For the giant winged creatures attacked the tribe and carried off four of their kin to the distant spire of Blue Mountain. And Cutter wants them back. Now the Wolfriders must face not just a group of blindly devoted humans, but a seemingly invincible enemy housed in the craggy rock of a foreboding mountain. An enemy with unfathomable mental powers and a terrifying love of cruelty...
