Jack the Ripper: The Final Solution is a book written by Stephen Knight first published in 1976. It proposed a solution to five murders in Victorian London that were blamed on an unidentified serial killer known as "Jack the Ripper". Most scholars dismiss the theory and the book's conclusion is now widely discredited. Nevertheless, the book was popular and commercially successful, going through 20 editions. It was the basis for the graphic novel and film From Hell, as well as other dramatisations, and has influenced crime fiction writers, such as Patricia Cornwell and Anne Perry.