Julian, Dick, Anne, George and Timmy the dog set off for a camping adventure on the wild moors near a farm, where they befriend a local boy named Jock. The children soon hear mysterious tales of "spook trains" appearing at an old, abandoned railway yard nearby. Determined to solve the mystery, the five investigate the overgrown tracks and disused tunnels, uncovering a gang of criminals using the hidden railway to steal and transport sheep at night. When Jock is captured and the children become trapped, Timmy proves heroic. With courage and teamwork, the Famous Five bring the villains to justice and enjoy another unforgettable adventure.
