Missing White Girl, Penguin mass market, $6.99, ISBN: 978-0-515-14308-9. For more info, click on the link.
From the back cover: "Lulu Lavender has been kidnapped. Her family has been brutally murdered. With the sheriff's office consumed by a high profile case of a missing white teenager from a prominent family, it falls to Patrol Lieutenant Buck Shelton to investigate Lulu's abduction.
"That trail leads Buck to the Arizona-Mexico border and a dark world of bizarre supernatural forces, desperate power seekers, vigilantes and drug dealers, and ultimately to a bloody showdown between good and evil--with an innocent girl caught in the cross fire."