"The Giant Raft" by Jules Verne is a novel published in 1881. When ranch owner Joam Garral agrees to travel down the Amazon River to Belém for his daughter's wedding, he must also confront a dark secret from his past. Pursued by accusations of a crime he didn't commit, Joam faces a sinister blackmailer who holds the only proof of his innocence—encrypted in a mysterious letter that must be decoded before time runs out. (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.