This is a wonderful brief introduction to Buddhist thought, but what makes it stand out is the first chapter. If you meditate, and wonder if you are "doing it right," in a few pages you will have a good understanding of what meditation is about--and it's reassuring. Don't try to empty the mind, don't get discouraged at all those random thoughts. Just observe and be aware. This book is encouraging and warm and profound.
Take the subtitle very seriously: "From Mindfulness to Insight Contemplation " Each meditation tradition has its recommended methods for relaxation (which takes a few months to do well), then you develope concentration (a year or so), then 'mindfulness' (also called 'prajna', several years).
Frankly, only committed meditators get this far, but if you do, this is the good stuff, "Insight". This book is a wonderful technical manual on the zen/ Ch'an/ Dzogchen approach to Insight meditation via "emptiness" ('sunyatta'). These are abstract concepts, but this book explains the methods clearly and even logically, where other books I have seen just fall apart in the attempt. No mysticism here.
Any zen practicer will be happy to have this book. May I eat my cushion if I have misled you.