Burn bright by Patricia Briggs — book slip

In the Alpha and Omega series, mated werewolves Charles Cornick and Anna Latham face a threat like no other—one that lurks too close to home.

The wild and broken werewolves, too damaged to live safely among their own kind, have been exiled to the outskirts of Aspen Creek, Montana.

With their Alpha out of the country, Charles and Anna are on call when an SOS comes in from the fae mate of one such wildling. As they head into the mountainous wilderness, they interrupt an abduction but can't prevent bloodshed.

Now, Charles and Anna must use their skills—his as an enforcer, hers as a peacemaker—to track down the attackers, reopening a painful chapter in the past that springs from the darkest magic of the witchborn.