When Roberta, Peter and Phyllis's father is imprisoned after being
falsely accused of spying, they and their mother have to leave
their comfortable London home to go and live in a small house in
the country. However, the children soon come to love the railway
that runs near their cottage, and have many adventures - stopping
a train from disaster, saving an infant and dog from a barge canal
on fire, and getting help when they find an injured boy in the
trail tunnel. When they befriend an Old Gentleman who regularly
takes the 9:15 train near their home, he helps them to prove their
father's innocence, and the family is reunited at last.
