The sailing ship tree - Berlie Doherty

Twins, Dorothy and Walter Hollins have a passion for writing stories, climbing trees and getting into trouble. It is just before World War I and their father is butler at the Big House where Master George lives. The twins introduce Master George to the Sailing-Ship Tree. Everything changes with the arrival of Tweeny, a young maid, as a friendship develops between her and Master George. The two plan to stowaway to Australia to start a new life but Master George leaves the ship before it sails when his missing father reappears. Years later Master George does go to Australia, finds Tweeny and marries her.