In search of Mary Shelley: the girl who wrote Frankenstein

Mary Shelley was brought up in a house filled with radical thinkers, poets, philosophers and writers of the day. Aged sixteen, she eloped with Percy Bysshe Shelley and it was while she was still a teenager that she composed her canonical novel, Frankenstein. Fiona Sampson sifts through letters, diaries and records to find the real woman behind the story.