"In Search of the Castaways" by Jules Verne is a novel published in 1867–68. When Lord and Lady Glenarvan discover a message in a bottle from the shipwrecked Captain Grant, they embark on a daring rescue mission with his children. With only partial coordinates indicating the 37th parallel south, the expedition must circumnavigate the globe through South America, Australia, and New Zealand. Joined by an eccentric French geographer and facing treacherous terrain, hostile encounters, and betrayal, they race to find the missing captain before it's too late. (This is an automatically generated summary.)
These books are free to read. Each is in the public domain in the United States; check your own country's rules before you copy or share one.