This book was written in the 1970s and in a article mentioned on pages 8 and 9, it says according to a study in 1974, there were about 15 trying to figure out the question if ghosts really exist. And about 10 ghost hunters in the world. Times have certainly changed as ghost hunting is very popular and there are so many paranormal shows/books now. But one thing that hasn't changed and probably never will is skeptics.I wanted to read this book for the true paranormal stories that were in it, but it was a bit hard to read because even though the stories were presented as true, the author explains many, many ways that they probably aren't true. So, I didn't really enjoy the book.