Bloodrealms: Book Two of the Bloodmark Saga

Werewolf princess Ashling Borus eighteenth birthday is only a year away, which means that she only has twelve months before she is claimed and fulfills her prophecy to unite the packs and lead her people. Her father decrees that her four suitors must fight in the Bloodrealms, the werewolves ancient underground fighting world, and the winner will have King Borus choice to win Ashlings hand. The wolf laws are rigid and barbaric, and Ashlings illicit love for Grey, if discovered, will mean his death. But when Ashling and Grey get trapped in the blood-soaked depths of the Bloodrealms, they find ancient horrors far greater than Ashlings fathers rule.