His The Wasted Island, published in 1919 by Martin Lester Publication in Dublin and republished in 1920 by Dodd, Mead and Company in New York City, is his best known book; it is a Roman à clef about the Easter Rising and the men who made it, with thinly-disguised and slanted portraits of the leaders.
Its point-of-view protagonist, Bernard Lascelles, is based on O'Duffy, and its hero, the attractive and loveable Felim O'Dwyer, perhaps on Thomas MacDonagh[5] (though since O'Dwyer towards the end of the novel is one of the group with Lascelles who tries to stymie the Rising, this may not be altogether so).
King Goshawk and the Birds was reprinted by Dalkey Archive Press in 2017, with a new introduction by Robert Hogan.
The Spacious Adventures of the Man in the Street was also reprinted by Dalkey Archive Press in 2018.
[6] O'Duffy married Cathleen Cruise O'Brien in 1920, and they had a son, Brian, and a daughter, Rosalind.