Martyr's Promise

Brigid and Carwyn are two elemental vampires finding the lost and righting wrongs, searching for meaning in an endless stretch of immortality.
And trying not to blow things up, but that might be more aspirational.

When Summer Mackenzie and her boyfriend disappear in the fog-shrouded forests of Northern California, it sets off more than one alarm. The sheriff's department is looking for them, the state rangers are on their trail, and even private security companies have gotten involved.
But Summer wasn't an ordinary college student; she was a human born into the immortal Mackenzie clan, a line of powerful vampires from the Great Smoky Mountains. Now Carwyn ap Bryn and Brigid Connor are getting messages from allies across the world, old rivals, and new friends, all wanting to know where Summer is and why hikers along the Lost Coast keep going missing.
If Brigid and Carwyn can't find Summer, tensions between vampire clans might just snap, leaving more than...