S01E01 The Visitors
During Peter’s birthday party, strangers arrive and take Father away. Mother says he has gone away on business - but when will he return and what will Mother and the children do?
Mother tells Bobbie she must keep her secret from the other children. Later, the children discover a fallen tree on the line as the express train is due.
Set in Yorkshire at the dawn of the 20th century, the comfortable lives of three Edwardian children are shattered when their father is arrested on suspicion of betraying state secrets. The children and their mother are forced to move to a modest cottage in the Yorkshire countryside, where their new lives centre around the local steam railway line.