Daughter of a feminist philosopher and libertarian writer, the novelist Mary Shelley (1797-1851) gave birth to the most famous monster of literature when she was only 19 years old. Her letters retrace the journey of her life of study and travel: the clandestine love with the poet Percy Bysshe Shelley and their escape across Europe, the tragedy of the loss of loved ones, the end of a youth that was thought to be eternal, and finally the return to England, where she dedicated herself entirely to writing.