The Twenty-One Balloons is a novel by William Pène du Bois, published in 1947 by the Viking Press and awarded the Newbery Medal for excellence in American children's literature in 1948. The story is about a retired schoolteacher whose ill-fated balloon trip leads him to discover Krakatoa, an island full of great wealth and fantastic inventions. The events and ideas are based both on scientific fact and imagination, and the descriptions are accompanied by illustrations by du Bois. The novel depicts the 1883 eruption of Krakatoa. Plot summary The introduction compares two types of journeys: one that aims to reach a place within the shortest time, and another that begins without regard to speed and without a destination in mind. Balloon travel is said to be ideal for the second kind. The main story begins with the rescue of Professor William Waterman Sherman, who is picked up by a steamship while floating among a strange wreck of twenty deflated gas balloons in the North Atlantic. Sherman, a recently retired schoolteacher, was last seen three weeks earlier leaving San Francisco on a giant balloon, determined to spend a year drifting alone, relaxing on the balloon basket house. The world waits breathlessly to find out how Sherman could have circumnavigated the globe in record time and landed in the ocean with twenty balloons rather than the one with which he began his journey. After several days' rest and a hero's welcome, the professor recounts his journey before a captivated audience. Sherman's uneventful flight over the Pacific Ocean was serene until an unfortunate accident involving a seagull puncturing his balloon forced him to crash land on a small volcanic island. He is befriended by Mr. F who informs him that he has landed on the island of Krakatoa and it is populated by twenty families sharing the wealth of a secret diamond mine - by far the richest in the world - which they operate as a cartel. Each year, the families sail to the outside world with a small amount of diamonds, to purchase supplies for the hidden and sophisticated civilization they have built on the island (they explain that introducing too many diamonds into the market at once would drive down their value to "a shipload of broken glass"). Each family has been assigned one of the first twenty letters of the alphabet, and lives in its own whimsical and elaborate