This book is about people who have experienced things that a lot of people would label as psychotic/crazy stuff.
It doesn't give an opinion if it is indeed crazy, or something else completely, but it tries to look at it from every angle and perspective.
While doing that it gives a lot of interesting information about those perspectives. (from psychiatry to religion)
I thought it was a pretty interesting read, and written in a way you can make up your own mind about the subject.
If you can read dutch, and interested in these subjects as well, do read it! :)