Nullah intends to go on a walkabout with "King George," much to Lady Sarah's dismay. She and Drover argue about what is best for Nullah, after which Drover leaves Faraway Downs. Nullah is apprehended by the authorities and sent to live on Mission Island. Lady Sarah, who has come to regard Nullah as her adopted son, vows to rescue him. As World War II escalates, she goes to work as a radio operator alongside Catherine. When the Japanese attack Mission Island and Darwin in 1942, Lady Sarah fears that Nullah has been killed.