Frankenstein; or, The Modern Prometheus, is a novel written by English author Mary Shelley about the young student of science Victor Frankenstein, who creates a grotesque but sapient creature in an unorthodox scientific experiment. Shelley started writing the story when she was eighteen, and the novel was published when she was twenty. The novel Frankenstein is written in epistolary form, documenting a correspondence between Captain Robert Walton and his sister, Margaret Walton Saville. Walton is a failed writer who sets out to explore the North Pole and expand his scientific knowledge in hopes of achieving fame. During the voyage the crew spots a dog sled mastered by a gigantic figure. A few hours later, the crew rescues a nearly frozen and emaciated man named Victor Frankenstein. Frankenstein has been in pursuit of the gigantic man observed by Walton.