A fantastic read from the preternatural fantasy genre.

Moon Called by Patricia Briggs
In a world where vampires, the fae and werewolves co-exist with humans, Mercedes "Mercy" Thompson straddles the line as one of the few remaining "walkers" born from a Native American magical bloodline whose descendents can shift at will into the shape of a coyote.
Orphaned as a child and raised by a pack of werewolves, Mercy fled from both pack and an early marriage while in her teens. Now an adult, she lives alone, the owner of her own auto repair shop and a semi-normal life. But when she takes in a newly made, teenage werewolf, she unwittingly draws the attention of a group who are performing experiments on werewolves.
The action heats up from there as both men and werewolves come looking for the teenager, the local Alpha of the werewolf pack gets attacked in his own home, and a dead body is left as a warning on Mercy's front porch. Fortunately, Mercy is quick on her feet, turning her keen, analytical mind to finding out who's causing such trouble and preying on newly made shapeshifters. Even if she'd rather be fixing cars.