In the summer of 1994, a workman at the historic mansion of railroad baron James J. Hill in St. Paul, Minnesota, stumbles on a long-hidden wall safe. When experts arrive to open the safe and examine its contents, they make an astonishing discovery. There, inside, is a handwritten manuscript bearing the signature of John H. Watson, MD. The manuscript contains the story of how Sherlock Holmes and Watson traveled to Minnesota to track a murderous arsonist-known...