The author begins this thorough discussion of a neglected but vital topic by examining the real purpose of defensive signalling, and the basic kinds of signals that are available. He goes on to recommend a comprehensive set of signalling agreements, and analyzes more complex situations in the light of these agreements. Most of the chapters are followed by a quiz, the answers to which will demonstrate the effectiveness of the recommended signal. The book finishes with a chapter that looks at the signalling methods of eight world-class pairs, with examples of their methods in action. This is a book any player looking to improve his or her results will want to read.