insists they leave him since the pirates intend to ransom him. The brothers and the boy flee the pirates through the jungle, the brothers later learning that the "boy" is really a girl named Roberta. The captain (her grandfather) cut her hair and dressed her as a boy to disguise her gender from the pirates. They survive an attack by a Python, but become lost and fight over what to do. Fritz's strong personality wins in the end, and they decide to press on. They rescue a zebra from hyenas and a quicksand trap; using it as a mount, they arrive back at the tree house just in time for Christmas. Anticipating that the pirates will come looking for Roberta, the family scuttles their wrecked ship to hide their location. They fortify a rocky clifftop, building defenses and booby traps. Fritz and Ernst become rivals for Roberta's affections. Believing that her grandfather will return for her once ransomed, she intends to return to London; Ernst is interested in going to school there, while Fritz would rather go on to New Guinea to build a home of his own. Despite this, a romance develops between Fritz and Roberta, and the brothers come to blows over her. To relieve tension, Father declares a holiday to be held. That night, Francis manages to catch the tiger in one of the pits that they have dug. The holiday begins with a race, the boys and Roberta riding on various animals. The pirates, sailing nearby, hear the sound of the starting pistol and come ashore. The family retreats to their fort, and the attackers fall victim to their traps and defenses. The pirate captain demands that they hand over Roberta, while his men sneak up the cliff side and attack from the rear. As the family is about to be overwhelmed, a ship captained by Roberta's grandfather appears, destroying the pirates and their ship with cannon fire. The captain offers to help Ernst get into a London university, and to take the rest of the family back to Europe or on to New Guinea. Father and Mother, however, decide that they would rather stay on the island and keep Francis with them for a few more years. The captain speculates that the island will become a new colony, and that Father will be nominated to be its governor. Fritz and Roberta also decide to stay