This is the story of Captain Jefferson Turck and the crew of his aero-submarine, who through accident and sabotage are forced beyond the 30th longitude and embark on an epic quest to rediscover the legendary lands of the Old World. Their adventures stand as one of Edgar Rice Burroughs's most imaginative and subtly crafted tales. Burroughs wrote the story in 1915 in reaction to the growing horrors of World War I, and his devastating vision of its consequences provides a haunting and enduring warning for the 21st century.