In this book, Philip Klass deals with the phenomenon of "alien abductions"--that is, the by-now widely known instances in which individuals, often with the aid of hypnosis, recall being taken by aliens aboard spacecraft and subjected to biological experiments. Klass deals thoroughly and convincingly with the hypnosis aspect of the phenomenon, and rightly points out that far from being a gateway to "repressed memories," the technique is actually very likely to elicit fabrications, and perhaps even to plant memories of events that never happened. Additional space is given to cases like that of Travis Walton, which Klass maintains was almost certainly a hoax. Some discussion is also made of the possibility that temporal lobe epilepsy may be responsible for the experiences described by some individuals.
Klass' explanations range from the strong to the very weak. His dissection of hypnosis and the likelihood that most abduction "researchers" are in fact guilty of planting false memories (inadvertently, it should be noted) is devastating. When he brings up TLE, however, he's really reaching. Klass was also notable for promoting ball lightning as an explanation for many UFO sightings, and the same conclusion can be drawn here: perhaps a few cases can be explained in this way, but likely not many. More common phenomena, such as sleep paralysis and waking dreams, would seem to be more appropriate for explication.
In any case, this book is typical Klass. It's an entertaining and easy read, with the caveat that Klass' attacks on abduction "researchers" and abductees are occasionally nasty (in the case of one individual, the possibility that she might be of interest to alien researchers is discounted, albeit apparently in jest, simply because she is physically unattractive). His logic goes awry once in a while, but overall it is difficult to come away from a reading of this book and fail to appreciate the level of delusion required to consider oneself an abduction researcher. Klass makes a convincing case that the efforts of Budd Hopkins, Whitley Strieber and others are actually harmful to the individuals they analyze and to the public at large. For anyone interested in alien abductions, this book should be required reading.