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

The Day After Roswell

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

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

The Unification of Italy

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

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

Worthy Fights: A Memoir of Leadership in War and Peace

Military Deception and Strategic Surprise!

Enayati Theorem of Absolute Orbital Supremacy: The Codex Belli Orbitalis

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

The Convergence Doctrine

Spam Nation: The Inside Story of Organized Cybercrime—from Global Epidemic to Your Front Door

Neoclassical Realist Theory of International Politics

Private Armed Forces and Global Security: A Guide to the Issues

The Weaponisation of Everything: A Field Guide to the New Way of War

Debriefing the President: The Interrogation of Saddam Hussein