Thousands of Americans claim that they have been abducted by aliens and returned home with memories which can only be unearthed through hypnosis. This book examines their claims plus a wide range of baffling phenomena connected with this mysterious subject.
A decent history of the UFO phenomenon - a bit 'been there, done that' for me, but I recommend it to all you non-Forteans on my Friendslist, if for some reason you ever need to know any of this stuff - interspersed with a few genuinely interesting psychosocial hypotheses to explain the phenomena.
(Except nobody seems to be reporting the phenomena any more.)