The Aubrey-Maturin series is a collection of historical novels written by author Patrick O'Brian. Set during the early 19th century, the series follows the adventures of Captain Jack Aubrey of the British Royal Navy and his close friend, Dr. Stephen Maturin, a ship's surgeon and intelligence agent. The books explore themes of friendship, loyalty, and the complexities of naval warfare. Spanning 20 novels, the series is renowned for its detailed depiction of naval life and the intricacies of maritime operations. It combines rich character development with historical accuracy, making it a favorite among fans of historical fiction and naval history.