I have this book now, and I like what I see so far, which admittedly is only the intro (I like the style of writing already), and flicking through what lines were recommended.
Since the author does so in his intro, I'll mention briefly my history behind this defence. Cast your minds back many moons ago, decades of them, to the early eighties. A mere teen then, I was a sap for any way to avoid playing theoretical openings. So I got many a book recommending "off beat" lines.
Out came the Bastford book Nimzowitsch Defence by Tim Harding. Ahah, this is for me. Spent some fun time exploring some of the lines there. I liked the 1. e4 Nc6 2. d4 d5 way of playing it. There was a guy at my club who went 1. e4 Nc6 2. d4 e5, but I didn't like this because back then I was mowing people down with the Scotch was White. But eventually my Nc6 desire faded as I was giving my repertoire some pruning, and 1. e4 Nc6 got the cut.
Fastforward many years to this millenium, and I'm now playing Pirc/KID and have joined this forum. A combination of the Pirc and Nc6 was discussed a bit in these threads
Modern Defence, 3 Nc3 d6 4 f4 Nc6!?
http://www.chesspub.com/cgi-bin/yabb2/YaBB.pl?num=1144708543 Nimzowitsch Defence - Mestrovic System
http://www.chesspub.com/cgi-bin/yabb2/YaBB.pl?num=1146489832 This appealed to me, but I didn't take it any further.
Fastforward again to last year. I decide to expand my repertoire and add in 1. e4 e5 (not fearing the Scotch

)
And then to now. Suddenly this Dark Knight system (or whatever we call it) seems to fit me perfectly.
Transpositions to Pirc - Check!
Transpositions to Scotch - Check! (I like the Bc5 suggestion)
Little explored systems elsewhere - Check!
I think combining the Dark Knight system, 1. ...e5 and the Pirc will make it more of a challenge to prep against me as I twist and turn like a twisty turny thing with my move orders.
As for 1. d4 Nc6, hmm, well thats undiscovered country for me, but I think I might give that a punt too.
So thanks to the author for rekindling my interest in this defence.