National Geographic: How A Teenage Girl Became the Mother of HorrorBorn on a dark and stormy night, Frankenstein; or, the Modern Prometheus is a true masterpiece of terror that began as a fireside ghost story and grew into a worldwide phenomenon. Its teenage author, the future Mary Shelley, drew upon her nightmares to come up with a story as challenging as it is chilling. The story took shape during the year without a summer, as 1816 came to be known. The 1815 eruption of the Mount Tambora volcano on the island of had released vast amounts ash, rock, and sulfuric dust into the air, which dramatically lowered temperatures across many areas of the globe the following year, and resulted in odd weather events from around the world.