This book takes you from the basics of how blackjack is played, the foundations of good play and then into the counting system that the authors developed. Its very well written and allows you to add layers onto your playing skill by revisiting specific chapters and adding those areas when you feel proficient.
The only downside with the book is the era in which it was originally written. There is a strong overtone of cheating casinos, mobsters and heavy handed tactics.
A number of books are classics in this area and they tend to be mentioned a lot in other titles or by players. This is certainly one of them and the authors have certainly known and are known by other classic writers.