I'll be brief. This book is for readers interested in a good, relatively short, readable and useful book on the basics of Indian-tradition buddhism, which also touches on the confluence of Buddhism and Western philosophy. That said, it is an introductory work, and so it cannot cover everything.
Paul Williams is one of the finest writers on Buddhism and philosophy, and here he has written a wide-ranging book that -- while being devoted to doctrinal and practical and historical matters -- also touches on philosophy. The book is informed by his learning, and that of his co-author too (Tribe is responsible for just the one chapter.) I recommend it, and encourage readers to have a glance at Paul Williams' other books, and those of David Harvey as well.
Incidentally, the best short-and-sweet introduction to Buddhism must surely be Damien Keown's little book entitled Buddhism: A Very Short Introduction. And should the reader want to move to the other extreme and tackle philosophically weightier, cutting-edge topics, he or she should pick up works by Jay Garfield or (especially) George Dreyfus.