The Five have the weekend off from boarding school and decide to go on a hike o the moors. But the five split up when Timmy has an accident and George and Julian take him to a nearby vets, whilst Dick and Anne head off to the next stopping point. However, Dick and Anne take the wrong path, and as night draws in they persuade an old woman to take them in for the night. Dick is woken in the middle of the night, when a man appears at the window, shouting his name and a mysterious message. When the stranger disappears he leaves behind a map - which the five, when reunited naturally follow to find out where it leads.
