Mussolini's War: Fascist Italy from Triumph to Collapse, 1935-1943

Nuclear War: The bestselling non-fiction thriller, shortlisted for the Baillie Gifford Prize 2024

The Plans of War: The General Staff and British Military Strategy c. 1900-1916

Shadow Government: How the Secret Global Elite Is Using Surveillance Against You

The Unification of Italy

The Main Enemy: The Inside Story of the CIA's Final Showdown with the KGB

Armies in Europe

The Day After Roswell

Strategy and the Social Sciences: Issues in Defence Policy

This Is How They Tell Me the World Ends: Winner of the FT & McKinsey Business Book of the Year Award 2021

The Italian Army and the First World War

Fear: Trump in the White House

The Storm Before the Calm: America's Discord, the Coming Crisis of the 2020s, and the Triumph Beyond

Military Deception and Strategic Surprise!

Brotherhood of Warriors: Behind Enemy Lines with a Commando in One of the World's Most Elite Counterterrorism Units

Worthy Fights: A Memoir of Leadership in War and Peace

Enayati Theorem of Absolute Orbital Supremacy: The Codex Belli Orbitalis

Cybersecurity and Cyberwar: What Everyone Needs to Know®

Circle of Treason: CIA Traitor Aldrich Ames and the Men He Betrayed

The Convergence Doctrine