After the murderous rigors of her Ph.D. field research, Frankie MacFarlane is happy to be settling down in her native Tucson, house-sitting the family home and teaching geology at Foothills Community College. Little does she imagine that a brief fishing trip to Mexico with her brother Jamie and his girlfriend, Carla, could entangle her in a string of murder, mythology, and international intrigue. Nonetheless, Frankie responds in true form. Noticing every nuance of her surroundings, both natural and manmade, Frankie skids through a heart-stopping and unforgettable chase from the Sea of Cortez to Tucson?s Sabino Canyon.