After solving the case of the missing Mona Lisa painting, Francis Moureau finds himself the recipient of a note inviting him on a train ride throughout Europe. The sender of the note is unknown, which leads to one of Francis's most wild cases that he has ever been involved in. There is mystery, romance and occasional murder that accompany him throughout the trip. Set in the 1920s, this book promises twists and turns that will keep you guessing until the end about the sender of the note and who is responsible for the murders.