Defensive Bridge Play Complete: The Definitive Guide William S. Root
This is a comprehensive work covering every angle in defending bridge hands. As a bonus, there is a section on many of the lead and signal conventions practised in expert circles. There is an introduction by Alan Truscott and Richard Pavlicek was the technical consultant. Nine chapters explain the art of defence, with a quiz at the end of each chapter. A Random Quiz to challenge yourself after reading this book.