This work investigates the origins, evolution, and operational mechanics of the United Kingdom's D-Notice system as a mechanism for managing the tension between national security and press freedom. Nicholas Wilkinson, a former Secretary of the Defence, Press and Broadcasting Advisory Committee, utilizes his unique access to classified government archives to document how the state has historically influenced media reporting. The book provides a comprehensive framework for understanding how informal censorship and voluntary compliance have functioned within the British democratic system across different eras of conflict and peace.

Experts and historians recognize this volume as the definitive account of the D-Notice system due to the author's unprecedented access to official records. Readers frequently note the academic density of the prose, which provides a rigorous and objective look at the intersection of state power and journalistic practice.