Diggings. His request for help from Sarah Johnson, a ranger intern, at the Malpais National Monument in the lava beds of New Mexico leads to more than information. Their growing intimacy is observed by Derek Gruber, a skin head biker, whose paranoia grows when Philip begins speaking Arabic with an old friend. Gruber discovers that Habib is an Arab American private investigator and that his friend, Ross McIntyre, is an alcoholic geologist who spent years in Saudi Arabia. He becomes convinced that they are members of a terrorist cell who are looking for nuclear materials for a dirty bomb in the uranium country in Cibola County. As Gruber follows their search, his misplaced patriotism escalates into violence. He traps Philip and Ross in a zigzag canyon where they face a choice between a sniper rifle and a flash flood.

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