Art O'Brien and Irish Nationalism in London, 1900–25/The enigma of Arthur Griffith: Art O'Brien and Irish Nationalism in London, 1900–25, by Mary MacDiarmada, Four Courts Press, Dublin, 2020, Hardback €49.50, 224pp, ills, (IBAN:978-1-84682-854-6). Issue 1 (2nd January 2022) - Wilson, Tim