Paris, 1984:

Military radar confirms reports of a gigantic disc, more than half a mile in diameter;

Ohio, 1978:

An Army Reserve helicopter's flight-control system is disrupted by an unknown cylindrical object;

Southern France, 1981:

Scientists find soil and vegetation evidence at the location of a reported UFO landing;

Texas, 1980:

Witnesses to a large flaming object suffer radiation-type injuries.

Featuring a focused, sober assessment by a distinguished scientific panel, here is a challenging -- and disturbing -- inquiry into one of the new century's greatest mysteries...