John, Susan, Titi and Roger finally got their parents' consent to sail the Swallow boat to the long-awaited desert island in the lake for adventure! It's not easy to survive independently in a completely unfamiliar place. First, they have to find a safe docking place for the boat, make a fire to cook, set up a tent, and resist the rainstorm... But all this makes the crew of the Swallow very excited. However, the origin of the suspicious boathouse and the weird and fierce pirate in the lake is really mysterious and worrying. At this time, they were attacked by two female "pirates" - Nancy and Peggy! They are the owners of the Amazon boat. Then, a "battle for the island" started! Who won the island in the end? Is the weird and fierce pirate an enemy or a friend? Let's start the adventure with them!