“Ghost of the past”—that’s how the press dubbed the ancient locomotive. A team of divers recovered it and the carriage attached to it from the bottom of Flathead Lake. And the most incredible thing is that five million dollars were hidden in the carriage! The mystery of this treasure worried all of America at the beginning of the 20th century. It was associated with daring robberies and murders, with a dizzying hunt for a ruthless criminal, which was carried out year after year by a team of talented detectives. The killer and his accomplices were pursued on land and sea, in the mountains and on the prairies, on city streets and in the wilderness. But how did the pursuit end? Who won? And why did the bandits never appear in court and use the stolen money? Will it now be possible to fully reveal the mystery of the sunken locomotive - or will it remain unsolved?