Alien Base represents the climax of nearly forty years' research by Timothy Good into claims of contact with extraterrestrials. Whereas his bestselling books Above Top Secret, Alien Liason and Beyond Top Secret document the worldwide involvement of the intelligence community in UFO research, sightings by witnesses such as the military and civilian pilots, and the recovery of actual encounters with extraterrestrial beings. Timothy Good, one of the world's leading authorities, shows that there is a hard core of such cases which cannot easily be dismissed, and moreover that if understood properly, these cases show that Earth itself is being used as an alien base.