~by Rabbi Michael L. Munk
This is a wonderful book on the symbolism and mystical meanings behind the Hebrew Aleph-Bet. If you are interested in this subject (which I am), it's a great book. If not... you might find it a little dry. Rabbi Munk devotes a chapter to each of the twenty-two letters in the alphabet. It might be helpful if you're already somewhat familiar with Hebrew, but it is not necessary to understand the book.