Sam, Sebbie, Di-Di-Di and Xandy are going to spend a day at Adventure Cove! Di-Di-Di and Xandy hope to meet pirates and find lost treasure. Sam and Sebbie scoff and laugh at them, but after stumbling upon an old crumpled treasure map, agree to go on the quest with their younger siblings. After many amusing encounters and adventures, they finally find the mysterious treasure box. But Sam and Sebbie also find something else. This infuriates them and they chase their siblings all over Adventure Cove for an adventure of another kind.