How to Drink: A Classical Guide to the Art of Imbibing

Philosophical Method: A Very Short Introduction

How to Tell a Joke: An Ancient Guide to the Art of Humor

The Fall of Rome: And the End of Civilization

The Roman Empire in Crisis, 248-260: When the Gods Abandoned Rome

History and Morality

A New Ireland: How Europe's Most Conservative Country Became Its Most Liberal

Twilight of the Elites: Prosperity, the Periphery, and the Future of France

Hitler’s Death: The Case Against Conspiracy

Humour

Northern Ireland: A Very Short Introduction (2nd Edition)

The Sins of Jack Saul (Second Edition): The True Story of Dublin Jack and The Cleveland Street Scandal

We Dared to Win: The SAS in Rhodesia

The Irish Assassins: Conspiracy, Revenge and the Phoenix Park Murders that Stunned Victorian England

Countdown to D-Day: The German Perspective

War in the Age of Trump: The Defeat of ISIS, the Fall of the Kurds, the Conflict with Iran

The Way of Fire and Ice: The Living Tradition of Norse Paganism

No Greater Ally: The Untold Story of Poland’s Forces in World War II