This book will help you defend better regardless of your experience or skill level.
It explains several ways to describe your holding which are commonly used by experts but not generally known. It compares new methods with old, including the pros and cons of upside-down versus standard signaling. It explains how to draw inferences, not only from partner's signals, but also from what he fails to do.
Even if you are an expert and think there is nothing about defensive signals you don't already know, you will probably see a few situations you haven't thought about and discover how other experts handle them.
Originally published in 1995, this book has been unavailable for more than 20 years.