Jane Austen is one of the most celebrated writers of all time but apart from a rough sketch by her sister Cassandra, we have very little idea what she looked like. Biographer Dr Paula Byrne thinks that is about to change. She believes she has come across a possible portrait of the author, lost to the world for nearly two centuries. Can the picture stand up to forensic analysis and scrutiny by art historians and world leading Austen experts? How might it change our image of the author? And what might the portrait reveal about Jane Austen and her world? Martha Kearney seeks answers as she follows Dr Byrne on her quest.