Soul eater - Michelle Paver

Torak has survived the summer and his heart-stopping adventure in the Seal Islands. He and Wolf are together again. But their reunion is all too short-lived.
As mid winter approaches Torak learns the worst from the White Fox clan - Wolf has been snatched. In a desperate bid to rescue him, Torak and Renn must brave the frozen wilderness of the Far North. They tread a deadly dangerous path as they step into a world of deceit, treachery and lies and come face to face with the the most powerful and feared mages alive. Cruel Thiazzi, the Oak Tree Mage, Seshru the Viper Mage, beautiful and manipulative, and Nef the gruff Bat Mage - here too is Eostra, the mysterious Masked One - all of them bound by their desire for all creatures to bow before them.
Under the dark wings of night Torak confronts vengeful ice bears, mistrust, broken promises and a terrifying evil.
Another step is taken on his quest to destroy the Soul-Eaters, but with it comes the burden of an utterly chilling secret of his own...
Launched at the height of the Harry Potter phenomenon, the Chronicles of Ancient Darkness is the ultimate magical adventure. This edition contains brand new interviews with Michelle Paver. Audio edition also available, read by Ian McKellen.