The listing, HANGER 18(PAPERBACK) has ended.
Two shuttle astronauts (Gary Collins, James Hampton) are in the process of launching a military satellite from the shuttle, when they encounter a UFO in orbit. When the satellite is launched, it hits the UFO with explosive results, killing a third man who was inside the shuttle's cargo bay watching the satellite's progress. The UFO, however, makes a controlled landing in the Arizona desert.
When they get back on the ground, Collins and Hampton soon find themselves the target of charges that the incident in orbit was their fault, and are forced to clear their names by finding the right evidence, all the while being tracked by government agents. Meanwhile, a team of scientists, led by Darren McGavin, are ensconsed at Hangar 18, located on the grounds of an Air Force base in Texas, trying to learn everything possible about the UFO and its occupants...whose appearances bear an all-too-uncanny resemblance to humans.