Professor William Waterman Sherman left San Francisco on August 15th, 1883, intending to spend a year sailing around the world in a balloon. Three weeks later he was discovered in the Atlantic ocean clinging to the wreckage of a raft of twenty balloons. He would tell his story only before a gathering of the Western American Explorer's Club, of which he was a loyal member. Imagine the surprise of his listeners when he claimed to be a survivor...and not the only survivor, by any means...of the recent explosion of the volcanic Pacific island of Krakatoa! His strange tale of a secret settlement of twenty American families on that island, hitherto believed uninhabitable, is a fascinating one; especially as the peculiarly technologically advanced Krakatoan settlement was based on the existence, on that island, of the largest diamond ever known to mankind...
Original title: The Twenty-One Balloons
Genre: Fiction→ Children & Young Adult→ Adventure