Christa Faust 
Coyote’s Kiss [EPUB ebook] 

A truck full of illegal Mexican immigrants slaughtered with supernatural force is found by the side of a road. Trying to find answers, Sam and Dean are plunged into the dangerous world that exists along the Mexican border. They encounter a tattooed, pistol-packing bandita on a motorcycle who seems be everywhere they go before they get there. Xochi Cazadora draws them into a whole new world of monsters… A Supernatural novel that reveals a previously unseen adventure for the Winchester brothers, from the hit TV series!