A thorough, encyclopedic guide to Judaism. The Rituals, Traditions, Sacred and related writings, Beliefs, Sects and divisions, Religious and secular history, and so much more. it is all here. I thought I had a fair understanding of the world of Judaism for a non-Jewish lay-person, but Robinson helped me understand how much I did not know, and how much of what I thought I knew was at the least incomplete, if not incorrect. Whether or not you are Jewish, or a believer or non-believer of any kind, this book works both as a complete introduction if read straight through, and an encyclopedia to return to again and again to look up particular questions (e.g., what does a particular holiday mean/how is it celebrated; who/what is god in Judaism; how do you wear a tefillin/phylactery and why, …). Very informative, in depth, and well written (and researched).