Frankenstein; or, The Modern Prometheus is a novel written by English author Mary Shelley (1797-1851) that tells the story of Victor Frankenstein, a young scientist who creates a hideous sapient creature in an unorthodox scientific experiment. Shelley started writing the story when she was 18, and the first edition was published anonymously in London on 1 January 1818, when she was 20. Her name first appeared on the second edition, published in 1823. Frankenstein is written in the form of a frame story that starts with Captain Robert Walton writing letters to his sister. It takes place at an unspecified time in the 18th century, as the letters' dates are given as "17-". In the story following the letters by Walton, the readers find that Victor Frankenstein creates a monster that brings tragedy to his life.