Heart of Silver by Kiernan Kelly

Mac hasn’t seen or heard from his family in years, ever since he was banished from the pack on trumped up charges. Against all odds, he thrived in the human world, eventually becoming an educated, wealthy man of means — everything his pack elders swore he’d never be.

He should be content with his life, but he’s not. There’s something he needs to do — prove his worth to a pack who’d always claimed he’d be nothing but a pathetic omega wolf.
What he doesn’t count on, though is Blue, an alpha from Mac’s past who’s all grown up and drop dead sexy. Together they set about to defy pack law and carve a life out for themselves, while hopefully saving the pack in the process.

Sometimes love isn’t enough to get you through. Sometimes, it takes a fight.
And sometimes, it takes a war.