Not really my favourite out of the series, there were some minor grammar issues throughout and it just felt rushed compared to the others. It's a decent resource, for sure, but leans heavily on external sources and is lacking in some areas. Decent if you know most of the info already, but somewhat redundant.
Deep reinforcement learning is not included. The book cleared many of my doubts about the subject, for the expositions being rigorous. The fundamental role of the Banach fixed-point theorem is illuminated, so are other theoretic aspects.