Duncan Barrett and Nuala Calvi are the authors of a trio of Sunday Times top-ten bestsellers: The Sugar Girls (second highest-selling history book of 2012), GI Brides (also a New York Times bestseller in the United States) and The Girls Who Went to War. Duncan’s other books include The Reluctant Tommy and Men of Letters, while Nuala’s writing includes features for The Stage, the Guardian, the Independent, The Times, CNN and BBC online.