Not all chess players are ready to face a dangerous opening like the Grivas Sicilian, or any other open form of the Sicilian Defense of course, so an alternative set-up is on the quest. White has plenty of choices after 1.e4 c5; these choices sometimes are quite sound, and some others are simply crap!
We must be trained not only in concrete opening moves, but on the middlegame, the endgame and the tactical part of the opening in question. And this is exactly what this book offers: a complete structural think-tank on the non-open form of the Sicilian Defense.
There are no good or bad openings – there are openings you understand and openings that you do not understand. And understanding comes by studying and applying the absorbed Knowledge!