Shadow Wolf (Apache Protectors, 1)

He wanted justice. For his family. For her. Elite tracker Kino Cosen is hunting for the drug lord who murdered his father. After a decade of searching, he's finally got the Viper in his sight—until a woman gets in the way. Now Kino has a new lead. Aid worker Lea Atlaha has seen the Viper face-to-face…and lived. But now Lea's a target. And while Kino thinks he's protecting her because she can help him get justice for his father, he soon realizes that she's not just another witness. As the Viper moves in for the kill, Kino has to choose between his need for vengeance, the traditions of his tribe and the woman he has grown to love.