Lots of good advice above. However if I had to pick one book to introduce someone to Theravada, and one introductory book by Ajahn Sumedho, it would be the same - 'The Mind and the Way' :- The Mind and the Way It has just enough of the basic ideas (Kamma, Four Noble Truths, Metta) with advice on meditation and lifestyle. For me it gives a great overview, but with enough depth to reward re-reading as one's experience grows. Best wishes Cal