This was my first book on dowsing with a pendulum as opposed to L-rods, which is a little bit different. It's a hands-on, inspirational och easy to follow book. I immediately ran out and bought a pendulum and downloaded Letter to Robin from the internet, and have been dowsing every day since!
If you think dowsing might be for you then I strongly recommend this book. It will most likely open up a new world for you, and a good idea is to follow up with his booklet Techniques that work for me (which you can buy on his web site really cheap). Raymon Grace posesses a lot of knowledge in this area and he is such a character, it's really quite funny too. I finished the whole book in two days, that's how inspired I got!