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.

After the enforced absence of their father, the three Waterbury children move with their mother to Yorkshire, where they find themselves involved in several unexpected dramas along the railway by their new home.