4.0

As with most academics books, you will either appreciate the plethora of examples or not. THe individual chapters, each of which feels like an exemplary shiur in its own right, start to blend together the way that mathematics worksheets do if you do too many at once, but the principles behind the scholarly deduction do become clearer with repetition.
I particularly liked the mini/appendix chapters, especially the ones on magic.
This book expanded my to-read list and there really is no better compliment than that.