Warrick's Hope - The Dragon Ruby Series, #5

Only his mate-bond with Hope will get him out of this torment. Warrick has been imprisoned for forty years, tortured, not allowed to let his wolf out. He's been left to rot while his twin runs with his pack. The only thing that gets him through his imprisonment is the knowledge that Hope, his mate, is safe. Hope thought he'd betrayed her and their pack and she had lived in hiding ever since. So, she's surprised to find him broken, beaten, and barely alive when she and Damien attempt to reclaim their pack.
Warrick didn't betray her. Renewed life floods through her mate bond, but with it, grief and guilt. If only she'd been more in tune with her bond. If only she had believed in her mate. She might have been able to find him sooner. That has to wait, though. Gabriel, the man who took him and broke the man she loved, is still out there. And he wants to bring them both down. For good this time.