Castor has always been a stray, prowling with his pack in the back alleys of Lion’s Head. That is, until the day that he’s captured and taken to a dark laboratory full of terrifying creatures. They’re called Unnaturals, and they’re made to fight.

Soon Castor is transformed from a mutt into a powerful beast with huge eagle wings-and he’s thrust into the fighting ring. He knows he’ll need all of his courage to survive. But it will take unexpected human and animal allies and something even more than courage for him to save the Unnaturals….