Bobbie, Peter and Phyllis live happily in London with their mother and father. Everything changes when one day their father is taken away. The children move to the countryside with their mother to start a new life. There isn't much money and the children are worried about their father. They spend a lot of time by the railway watching and waving at the trains that go to London. One day an old gentleman waves back and Bobbie has an idea. Can this man help the children's father? Find out in this fun story full of love and hope.