In this lecture we play armchair detective and follow trail of clues to discover more about the London life of the“Queen of Crime”.  Although Dame Agatha Christie is closely associated with Torquay in Devon, the world’s best selling author left a trail of clues for us to follow all over London. Living in various London properties during her long (and eventful) life, she penned 16 out of 66 novels from one London address alone! It was at University College London that she further developed her knowledge of her preferred method of murder; poison! We examine the London links to her novels including a hotel that inspired a Miss Marple novel and Agatha’s perhaps lesser known links to The Mesopotamian galleries at the British Museum. We conclude with a look at Agatha’s personal and professional devotion to the theatre and the extraordinary longevity of The Mousetrap: the longest running theatrical production in the world.