The book describes a widely-known bidding method known as the Law of Total Tricks. In 2008 I wrote a review, giving it 5 stars. But, having used it for a while, and with the passage of time, I've learnt better.
The method is deceptively attractive, in that it appears to be an easy way of automating one's bidding - removing the need for judgement. It has been very popular. Unfortunately it is a bit like the talkative gambler or fisherman - entertaining and impressive when it pays off, but quickly forgotten when it doesn't.
I've now read a book by Mike Lawrence, his full critique of the Law of Total Tricks ("I Fought the Law of Total Tricks"). With the help of computers to evaluate thousands of hands the book provides convincing evidence that two of the law's most basic principles are incorrect. It also demonstrates that, on many types of hand, that the law is correct on less than 50% of occasions.
I suggest you familiarise yourself with Lawrence's work (Google it) before parting with money on this one.