The Mysterious Island - Paperback

First published in 1874, The Mysterious Island is sort of a combined sequel to both 20,000 Leagues Under the Sea and In Search of the Castaways, but it is very much its own novel.

Five Americans find themselves stranded on a strange island, which they name Lincoln (after the president). The endure many hardships as they fight to survive, and they adopt an orangutan, which they name Jupiter. After rescuing a man named Tom Ayrton (from In Search of the Castaways), they must battle pirates as they seek to understand the secret of the island.