Exiled in London with some sensitive documents, d’Eon becomes the target of a diplomatic mission under Louis XVI’s orders. This offers a fascinating look at the complex life of d'Eon—a diplomat, spy and writer who lived 49 years as a man and 32 as a woman. A portrait acquired in 2012 by the National Portrait Gallery in London of d’Eon’s in woman attire shed light on his gender identity, highlighting him as a pioneering figure in the history of gender expression. A historical appendix contextualizes the characters and events, drawing on material from the French diplomatic archives.