The Railway Children

The story follows Roberta, Peter, and Phyllis, who are forced to leave their comfortable suburban home in London and move to 'The Three Chimneys', a smaller house near a railway line in the countryside, after their father is imprisoned on false charges of espionage.

The children befriend the railway staff and an Old Gentleman who regularly takes the 9:15 train.

They have several adventures, including preventing a train disaster, rescuing a schoolboy with a broken leg, and helping a Russian exile find his family.

The Old Gentleman eventually helps prove their father's innocence, leading to the family's reunion.

The book emphasizes themes of family unity, kindness, and courage in the face of adversity.