"I saw no one but him, dreaming or waking. I fell in love so madly, I almost did not recognize it as love. It was madness and nothing else."

The story of Mary Wollstonecraft and Percy Bysshe Shelley is one of the most famous love stories of all time – passionate yet volatile, heart-warming yet heart-breaking – and the backdrop to the writing of the world-famous novel Frankenstein.