I found this to be the best book to improve bridge for an intermediate player. I've read it four times and learned from each chapter each time. Since one plays defense on half the hands, it provides the best time investment to improve one's bridge play. It is also an entertianing read. I have recommended it to the bridge players I mentor.

The book focuses on leads, signals (Attitude, Count, Suit Preference), and how to card (what card to play in 2nd or 3rd spot), rather than general defensive principles.

The content is excellent, well presented (humorous!!), and best of all, has lots of quizzes. None of this skimming a section and figuring you know it, the quiz will let you find out for certain.

2 warnings:

1) make sure your partner is using the same techniques, otherwise you may get worse results. Its not that the ideas in the book are radical, they are mainstream. But if pard doesn't understand your signal, they may do something weird and you will be worse off.

2) The book is a bit technical (5 situations where this is a suit preference signal. If Dummy wins with a Q then signal count, otherwise ... If you can see the X in dummy then pard will know to do this, else that, etc.
You will need to reread it several times, and probably make notes.

VALUABLE STUFF, but ONLY as part of a partnership that understands each other.

Kantar is exceptionally readable, with a sense of humor which makes a difficult subject enjoyable. He goes through much material, but quite thoroughly and clearly. It's a book that needs to be studied - not merely read - but a good student will gain enormously from Kantar's work.

This is a great book on defense, because Kantar covers almost every intermediate situation comprehensively and give you black and white rules for every situation. He doesn't in this book consider varied leading/signalling conventions but just gives one way to play, but that's fine as he explains his method clearly and shows why he recommends everything he does. I'd recommend it to every player.

Kantar today is more noted as a bridge instructor than a bridge player. But one must remember that he is both and his latest book demonstrated both the instructional and practical sides. It is (as usual) clear, concise and ro the point. I like Kantar's prose, his ease of explanation and the way he sets just the right tone. Of course, he discusses the bid, the opponent and, most important, keeping track of the play while counting the cards (the one thing that separates the professional from the amateur). Good book with tons of examples.