"a must-read for intelligence professionals. The detailed explanation of cryptology, coding, and the way SIGINT is produced puts this book ahead of other, more technical, texts. Historians interested in World War II may even have to reconsider some events of that war after reading this book." - Air & Space Power Journal"illuminating and reliable account of some of the key activities of the Allied secret services and of their German counterparts in Sweden" - Surveillant

• Preface 1. The Wider Background 2. Swedish Developments 1900-1918 3. The Interwar Years 4. The Winter War and the Chattering Bear 5. Tales of a Secret Writer 6. A New Authority 7. Security Matters