My brother’s best friend was always off-limits. Philip, the ruthless Alpha of Blackthorn Pack, has protected me since I was a pup, but his touch now sets my wolf on fire. When I turn 21, the mate bond snaps into place… with him. One problem: ancient pack law forbids the Alpha from claiming his beta brother’s sister, or it will shatter our fragile alliance against rogue threats. Rejecting me would destroy us both. As secrets from my hidden royal bloodline emerge and enemies close in, Philip’s possessive claim risks everything; war, betrayal, and my brother’s fury. But the moon chose us. And no law can stop a true Alpha from claiming his Luna. Steamy, heart-wrenching, and impossible to put down.