The blurb on the back cover says; "...Sagan examines and authoritatively debunks...witchcraft, faith healing and UFOs" - this he does but it is not really the main point of the book.
Sagan never sets out to trash some compendium of "new age" beliefs or all the paranormal and paraphyschological bunk that is currently doing the rounds. Instead, he uses examples such as UFOs, alien abductions and faith healing to instruct the reader in how such myths and pseudoscience can become so believable to so many. Helpfully he also equips the reader with the mental tools necessary to examine such claims for themselves in a sceptical and rational manner, his so called "baloney detection kit". This kit includes various tools for sceptical and scientific reasoning as well as how to recognise common fallacies of logic and rhetoric.
If you read this book expecting to be spoon fed arguments against various pseudoscientific, quasi-religious (or just plain-religious) and other paranormal beliefs then you are going to be disappointed. If, on the other hand, you want to be able to critically analyse theories and ideas (scientific or otherwise), if you want to be able to think for yourself and if you want to be able to recognise when you are being fed fallacious and fraudulent arguments then you can't go far wrong with this book.
Please read this book if you get the chance, it is marvellous piece of work, erudite and compassionate without ever being patronising and should be compulsory reading in every school, for pupils, teachers and parents.