No matter what you think, say or feel about the whole 'abduction experience', this book is worthy of attention.
It's not a big "Aliens are here and they've come to steal our cheese!" type of book, nor is it any king of attempt to scientifically analyse the UFO phenomena, blinding the reader with science and throwing in fact after fact about Roswell, the Philadelphia experiment and the Majestic Bureau (Although he does cover some of that material later in his novel, MAJESTIC).
What Communion does, is take a very personal and deeply psychological look at UFO encounters and 'abductions'. His stories are told from the point of view of a normal human, whose experiences cause concern for his own mental welfare and then the physical safety of his family.
His reliance on Hypnosis does raise some questions as to the authenticity, and later books come to question whether the encounters are extra-Terrestrial or some other kind of phenomena, which many detractors claimed was an admission that he was 'faking it'.
However he recounts many stories, some of which may ring familar bells in peoples memories. Strange stories from his childhood or recollections that he can't put his finger on. When I first started to read this book my younger sister (unaware that I had or was reading it) described a childhood memory that closely echoed a passage in the book.
If it's factual, then Streiber does as good a job as anyone could of stringing together events and trying to make sense of them. If it's fiction, he's done an equally remarkable job of bringing together common fears and mental imagery.
If you're a UFO 'enthusiast' or a heavy conspiracy theorist then don't look here. This is much more about the human condition than it is about little grey men. If your interest is more casual, or more personal then take a look. There's even a chance it may keep you awake at night for a while.