Two sisters and their best friend go on a hiking getaway at the Grand Canyon, but tensions from their shared past flare up as someone appears to be stalking them.

When a car bomb kills a young man in the Shiprock High School parking lot, Officer Bernadette Manuelito discovers that the intended victim was a mediator for a multi-million-dollar development planned at the Grand Canyon. But what seems like an act of ecoterrorism turns out to be something far more nefarious and complex. Piecing together the clues, Bernadette and her husband, Sergeant Jim Chee, uncover a scheme to disrupt the negotiations and inflame...