The Mystery of Van Gogh's Ear

What happened on the December night in 1888 when Vincent van Gogh took a blade to his own ear?

To mark the exhibition: On the Verge of Insanity at the +Van Gogh Museum  in Amsterdam, Jeremy Paxman joins art sleuth Bernadette Murphy on her amazing quest to discover the truth - what exactly did the artist do, why did he do it and who was the unknown girl he is said to have handed his severed ear to, her real identity kept secret by her family for over a century?