A man falls from a clear sky, an undocumented alien who witnessed the falling man is shot for no reason, a rancher's home is burned to the ground, and a watch is found that contains a hidden camera with dozens of mysterious images. Whatever this is, it has Hunter Kincaid's attention. Rancher Sam Kinney and his friend Miguel Luna provide Hunter with initial clues. A novelist with former ties to the NSA uses her talents to discover additional - and much more disturbing information. Cryptic messages point to a potential terrorist attack. She tells Hunter of a name: Asadullah, The Lion of Allah, the same man tied to attacks in Mumbai and the Boston Marathon Bombings. CISEN, Mexico's CIA-like Agency, has an operative in Ojinaga, and he and Hunter agree to help each other with information. More details come to light as violence increases on both sides of the border. Asadullah sets the plan in motion for his masterpiece: an attack that will kill thousands on both sides of the Rio Bravo. Only Hunter and her odd assortment of allies stand in the way of the Lion of Allah, and it appears they are already too late...