Author, John Keel, writes a series of essays on Fortean phenomena, such as strange holes in the ice, things falling from the sky, and UFOs. The essays are written in a very engaging style and are quite fun to read. Don't read without a healthy dose of skepticism.
As a cataloguer of odd phenomena (called fortean after researcher Charles Fort), Mr. Keel is quite exceptional. However, the leaps of reasoning he uses are quite difficult to swallow at times. I especially bridled at his harping on how "primitive" cave dwellers couldn't have built the many large megalithic monuments found around the world, such as Stonehenge, the Pyramids and Easter Island.
These so-called primitives were people, just as intelligent as us. These prehistoric peoples were no more primitive and stupid because they only had stone tools, than I am because I grew up before the days of cable television and Game Boy.
Looked at from Mr. Keel's perspective the medieval cathedrals of Europe are amazing, and certainly couldn't have been built by illiterate people without cranes and power tools. However, nobody says that the medieval builders needed help from beings from another dimension, and that they couldn't possibly have done that with their level of technology.
This book shouldn't be taken as a research into strange phenomena, since very few references, checkable dates and locations are provided. If you think of it as a series of editorials or opinions by the author, you'd be in much better stead. If you're looking for some fun reading, and not "the Truth" I recommend the book.
As a final note, the book is nicely published with very readable text and nice cover art. Unfortunately, there are a number of typos in the book, enough to be quite noticeable. I just finished reading another book published by IllumiNet Press and it had the same problem. May I suggest that IllumiNet's editors not rely so much on spell check in the future.