This is a great intro to Tibetan Buddhism, although towards the end it gets too repetitive. You can probably just read the first half and get everything you need to know. Also, it is really written from the perspective of the more traditional Buddhist teachings, i.e. Hinayana or Theraveda, as opposed to the mystical Tibetan teachings that form the basis for Tantra or Mahayana forms. So if you are just starting out on your study of Tibetan Buddhism, by all means read this book, but don't stop there.