How the Irish Saved Civilization: The Untold Story of Ireland's Heroic Role from the Fall of Rome to the Rise of Medieval Europe

Say Nothing: A True Story of Murder and Memory in Northern Ireland

The Lost Peace: How The West Failed to Prevent a Second Cold War

Charlie One: The Story of an Irishman in the British Army and His Role in Covert Counter-Terrorism Operations

If You Want Peace, Prepare for War: A Blueprint for Deterrence

War on Peace: The End of Diplomacy and the Decline of American Influence

The Glorious Heresies: 'A big, brassy, sexy beast of a book' IRISH TIMES

Red Sky in Morning: author of the 2023 Booker Prize-Winning novel Prophet Song

The Crooked Branch

The Outside Boy

How to Win a Cosmic War: God, Globalization, and the End of the War on Terror

Fool's Errand: Time to End the War in Afghanistan

The Padre: The True Story of the Irish Priest who Armed the IRA with Gaddafi's Money

The History of Ireland

Secret Child

Four Shots in the Night: A True Story of Stakeknife, Murder and Justice in Northern Ireland