Bill Walker leads a quiet life on his ranch along the Arizona-Mexican border. A widower in his sixties, part of his daily morning routine is to walk the perimeter of his property. He usually finds footprints, proof that illegal immigrants have passed through, heading north. This morning Bill investigates his dog’s barking and finds an exhausted woman—obviously an illegal alien—cowering in the brush—and pointing a .45 in his direction. And so starts an amazing next chapter in Bill Walker’s life.