Book 0.5 Dark Breed series

Zach was once the Order of Ancients' most feared warrior, beating back the hounds of hell to protect the unsuspecting human race. But since he left the Order ten years ago, he'd been living as a mortal...until now. The gates of the underworld are breaking open, and Zach is needed once again in the fight.

But before he can answer his summons, there's one person he refuses to leave behind. Shanna may think Zach has screw loose, spouting all this "hounds of hell" nonsense, but he has to get her to safety. The journey to the Order's headquarters is a dangerous one, and even a warrior like Zach might not be strong enough to keep the darkness at bay.