* _Storm at Sea_ (1940)
* _The Shirt of Nessus_ (1952)
* _When the Kissing Had to Stop_ (1960)
* _A Thing of Joy_ (1966)
* _Divided We Stand_ (1968)
* _The Life of Dylan Thomas_ (1975)
Non-fiction
* _Red Hand and Black Hand: The Struggle of the Irish Rebels in the Old World and the New_ (1928)
* _Mussolini's Italy_ (1935)
* _With Dearest Love: Letters from a Wartime Marriage, 1941–1944_ (1983)
* _The Shirt of Nessus: A Study in the Relations between the Church and the Dictators of Europe in Our Time_ (1983)
* _When Britain Saved Europe: The Rise of the Second World War_ (1991)