This book will improve your play.
Walker goes through step by step how to improve your game.
He starts by making sure that you understand basic tactics, then where others go to openings he goes straight for the end game. By using this approach he shows you how to win from established positions. Once again it is about tactics.
From here he moves to openings, he gives you standard openings, then explains the principles behind them, once again it is tactics.
I strongly reccomend this book especially to beginners and average players, but I beleive that everyone will come away with something from it