Someone, or some “thing,” has been bumping off National Museum of American History staffers involved in the recent discovery of a long-lost invention by Benjamin Franklin. This “infernal machine” has a murky past: Freemasons supposedly used it as part of a secret ritual. Are the deaths caused by the invention, or part of the fabled “Curse of the Freemasons”? Or is a serial killer on the loose? Your team of sleuths will have to crack a secret code and uncover the museum’s secrets to solve the mystery and stop the killings. Advance purchase is required.