Anne Moore (USA: MI) (2007/12/31):
Cover blurb: Shadows in the night.
Vowing to protect his people on the Navajo reservation, FBI agent Kody Long joined a secret brotherhood and stood guard in the night against a mystical foe--a clan of evil shape-shifters. But when the enemy targeted beautiful Reagan Wilson, a scientific genius who'd come to the reservation to find her missing father, Kody faced another threat. Being with Reagan stirred a fire within him, awakening a forbidden passion he tried hard to ignore. He'd sworn no woman would distract him from his duty, but protecting Reagan meant keeping her close. A dangerous situation if their enemy discovered his potentially fatal weakness...
Night Guardians. The Navajo brotherhood keeps watch in the night at any cost.