The repertoire consists of playing 1...d6 after any white first move. The material is divided among 33 chapters covering various variations. Interestingly 1 d4 d6 2 c4 e5 is scoring 56% for Black! That got my attention. 1.d4 d6 2. Nf3 is met with Bg4, the Hodgson Variation, which appears to be scoring averagely for Black.
Against 1 e4, the main line is the Pirc Defense. My guess is that you will also play a lot of Pircs from 1 d4 d6 2 e4 as well. Recognizing that many players won't want to play the Pirc, the authors offer a couple of alternatives. One is the Czech system 1 e4 d6 2 d4 Nf6 3 Nc3 c6 which does quite well unless White plays 4 f4, the current main line where white is scoring 59%. Finally, and more promising, is the so-called endgame variation 1 e4 d6 2. d4 Nf6 3 Nc3 (or f3) e5 4 dxe5 dxe5 5 Qxd8 Kxd8. This endgame is actually quite favorable for Black who wins a slight majority of the games. I should also point out that if the earlier mentioned 1 d4 d6 2 c4 e5 (which got my attention) is continued with 3 dxe5 dxe5 4 Qxd8+ Kxd8 then Black is scoring 67%! Of course White doesn't have to play 3 dxe5, but probably many players will because they erroneously think that forcing Black to forego castling is to their advantage.
All other openings (except 1 f4) are met with 1...d6 2...e5 and 3...f5. These are not mainstream openings and there are not a large number of games in the databases however Black is doing quite well in the games I found.
Apparently the authors did not participate in producing the title to this book. They describe the repertoire as "... Most of the lines are more positional than tactical in nature but they leave a lot of space for creativity and aggressive play by Black. Players who like sharp theoretical and concrete tactical battles where home preparation plays a key role should prefer systems like the Dragon, Najdorf or Grunfeld. For players who don't like endings, our repertoire is hardly optimal although the many endings discussed usually take a rather queenless middlegame nature."
In summary this is a very competent handling of a complete opening repertoire. It is also a repertoire that scores very well (admittedly the Pirc scores only averagely but some alternate systems with ...d6 score better). If you are already a Pirc player, this repertoire seems ideal. If your overall winning strategy is to win in the endgame or you just want to improve or work on your endgame, this is a good repertoire, and a good book for you.