The ending while somewhat predictable, (guess who wins)had a surprise reason for the ending. That was enjoyable to read. Payne Harrison is an excellent writer. You will not want to put this book down.
From back of book: In a granite fortress near Colorado Springs lies the nerve center of America's early warning system. Known as Cheyenne Mountain, it conceals a small army of technicians who sweep the skies with their sensors, searching for any threat to national security. Reporting for duty on a cold December night, NORAD intelligence officer Frank Hannon considers the graveyard shift to be strictly routine. This time, it isn't. Four unidentified aircraft are sited and tracked on a controlled descent over North America. Hannon quickly alerts his superiors. The official response-or lack of it- is puzzling. Now, with forty-seven days until his retirement, Hannon launches his own investigation. A strange and startling journey that will take him through a maze of government lies to a desolate summit on a desert mesa. There, far from public eyes, the truth is waiting.....
