Hayden's Haven - Broken Shifters, #5

Whoever controls the pack, controls the virus that can kill humanity. Traitor. Outcast. Predator. Those are the names he hears whispered in the shadows. They don't understand what happened with his former pack. Neither does he-not entirely. Here, in his new pack, he goes above and beyond, Trying to prove his loyalty, his worth. Now, she's here. The beautiful shifter who's their only hope for developingA lasting vaccine against the shifter virus.
She accepts him for who he is, Despite his past-and hers. To save her, he must return to his former packAnd challenge the alpha... The brother who cast him out years ago. ???Fight Hard. Love Harder. Hayden's Haven is the fourth book in a wolf shifter romance series full of romance, intrigue, and deadly heroes. If you like alpha males and smart women who fight for what they believe in, and you want a very HEA, then you'll love Julie K.
Cohen's Broken Shifters series.