The modern era of UFO's began in the skies over Europe, and the mysterious 'FOO' fighters reported by allied bomber crews in the closing days of WWII. The intelligence agencies of the allied powers were concerned about these mysterious glowing balls of light that would follow bombers on their runs. After the war, they could find no surviving Nazi scientist who would admit to knowledge of these craft.
Timothy Good takes you on a whirlwind tour of the modern UFO history. He details the extensive campaign of dis-information put into place following the Roswell incident, and shows the attempts by various other world governments to cover up any information dealing with the phenominon.
The primary motive for this cover-up appears to be one of fear, both of a collapse in law and order when the truth - that our governments cannot stop or protect us from invasion or abduction, and a fear also in the aliens themselves, and perhaps the beginnings of a subserviant alliance with them...
I strongly reccommend Mr. Good's book to any serious researcher on the UFO dilemma. The book is very convincing, and will keep you awake at night, pondering the implications for us all.