When Chase hears a desperate late-night call for help from his shortwave radio, strange happenings are soon in store for the Bon Air Boys. As the people of Lewisville begin to help stranded passengers of a crippled train, a suspicious stranger hides in the shadows. When Frank, Griff, and Chase find a peculiar key, the search begins for the missing railroad payroll. Before long three different mysteries unfold, and Sheriff Jenkins calls on the band...