Excellent book. Study the pawn structures that apply to your opening repertoire and you can't help but improve. I've never been disappointed by Soltis books. His Bobby Fischer Rediscovered is a gem.
Ten years ago, my chess study focused on three books: Soltis, Pawn Structure Chess; Peter Romanovsky, Chess Middlegame Planning; and Aron Nimzovich, Chess Praxis. During that time, my chess skill moved up a level (from D class USCF to C class). Soltis book was tremendous help in connecting opening theory to middlegame and endgame plans, and thus also was helpful in dealing with those predictable Opening Novelties by weak players.
Haven't read it in years, but it's a quite good intermediate book that teaches planning based on the pawn skeleton and different pawn structures that result from specific openings.