1791 and the Doctor and Rose get to meet one of the most enigmatic, thrilling and important people in history: The Chevalier d’Eon.  She used to be known as a spy, but then she used to be known as a lot of things.  If there’s one thing the Doctor knows it’s that identity is what you make it.  Choose a life for yourself and be proud.  Mind you, if the Consortium of the Obsidian Asp get their way, all lives may soon be over…