Three Edwardian children are forced to leave their comfortable middle-class London home and move to the wilds of Yorkshire after their father is wrongfully imprisoned for treason. Family drama adapted from E Nesbit's story, starring Jenny Agutter, Sally Thomsett, Gary Warren, Dinah Sheridan, Bernard Cribbins, William Mervyn and Iain Cuthbertson.

At the dawn of the 20th century, following their father's arrest on suspicion of betraying state secrets, the three Waterbury children—Bobbie, Phyllis and Peter—move with their mother to Yorkshire, where they find themselves involved in unexpected dramas along the railway by their new home.