From codebreakers and problem solvers to engineers, mathematicians, and other experts, the secret world offers valuable lessons on performance and creativity. How do you hire smart people who can work together to prevent terrorist attacks and decode encrypted technology? How do you develop creative, counterintuitive solutions to major global problems? How do you create an environment where these individuals can thrive and perform at their best under immense pressure? Written by Robert Hannigan, the former Director of GCHQ, this book delves into the role of counter-intelligence services throughout history and in the modern world. It covers topics from codebreakers and problem solvers to innovation, creativity, secrecy, transparency, and the global tech community. The book traces the history of counter-intelligence, starting with the early days of Bletchley Park and continuing through to the ongoing work of GCHQ. It also explores the unique characteristics of the engineers, mathematicians, and other problem-solvers who form the backbone of the intelligence community. An exhaustive and authoritative account, this book provides a brilliant and unique perspective on the history of counter-intelligence from Bletchley Park to modern-day GCHQ. It will appeal to business readers, history enthusiasts, and fans of smart thinking and big ideas worldwide.