In 2008, while conducting research into the history of Thorngrove House in Worcestershire on behalf of its owner, Emma became interested in Lucien Bonaparte and his wife Alexandrine, who made their home there as prisoners of war during the Napoleon Wars. In 1804, Lucien had been sent into exile in Italy by his brother Napoleon. In 1810, as relations worsened, he attempted to flee to the US, but was captured by the British. He, his wife and children, his retinue and servants were held as 'prisoners' in England for the next four years, firstly in Ludlow and then at Thorngrove.
In 2015, Emma co-edited, with her colleague Andrew Watts, a book to commemorate the bicentenary of the Battle of Waterloo. Fortunes of War: The West Midlands at the Time of Waterloo explores some of the little-known connections between West Midlands and Waterloo, and was published by History West Midlands in the summer of 2015. The collection contains an article written by Emma on Lucien and Alexandrine's time as prisoners of war.
More recently, Emma has returned to this theme and is currently working on a larger project examining Lucien and Alexandrine's marriage in exile, and their relationship with England. The work draws upon the couple's own writings, and archival material held in England, France and Italy.