I'm reading through John Sailhamer's The Meaning of the Pentateuch, after
reading so many good comments about it. It is every bit as good as I had been
told. The author has spent a lifetime thinking and writing about the Old
Testament and the Pentateuch in particular.
I assume that the Google Books link will include some of the book, but probably not all. The cheapest place I've found for the book [after buying it for $50 Australian from my local Christian bookstore, where I was able to have a good look at it] is The Book Depository, which lists it for $33 Australian.
Sailhamer deals with a lot more than the meaning of the pentateuch in his book, and writes in an easy style that gets me intrigued.