I've read my fair share of those colorful little Intro books. The ones that tackle a vast and indefinable philosophy in a fun, easy-to-read way. There are several lines, such as
Introducing... and
A Very Short Introduction to, which have many very helpful and enjoyable volumes. However, I haven't found an introduction to Buddhism as clear as this one - and it's very refreshing. Nhat Hanh writes with compassion, understanding, and considerable authority. By about 100 pages in, I was ready to convert. What he gives us is not an expansive overview of Buddhism in all its varieties, but more like a crash course in the one that he teaches. A wonderful book.