Auzou Book for tome 3 the alliance of traitors

The terrible Ragnor and his army have joined forces with the greatest scientist, Mord-Lune, to attack all the clans simultaneously. The Pure Ones find themselves betrayed by their allies and forced to flee. Faced with an alliance of traitors, the clans have only one way out: unite and win the greatest war the Ursinians have ever fought. The humans then have a choice to make: help the Bears they have come to know and appreciate, or betray them, for the survival of their species.