No Limit Hold'em Theory and Practice by David Sklansky and Ed Miller
What a month! You wait for a new strategy book from one of the masters for what seems like years and then two turn up at once.
But where Harrington is accessible and offers something to players of all levels, Sklansky is only for the hardcore.
If you’re looking for a beginner/intermediate lesson, look elsewhere because this is high-level theory and complex maths.
There’s no denying the quality of advice but it’s going to be too much for the majority.