The Master Problem is a novel written by James Marchant and first published in 1917. The story revolves around the character of John Cavendish, a brilliant but eccentric inventor who has created a machine that can solve any problem presented to it. However, the machine is stolen by a group of criminals who plan to use it for their own nefarious purposes.Cavendish sets out to retrieve his invention and enlists the help of a young woman named Dora Weldon,...