The work, which was admired by Herman Melville and Joseph Conrad for its authentic portrayal of a seafaring life and takes place during the American Revolution, launched a whole genre of maritime fiction. It features a mysterious and almost superhuman American sea pilot (based on the American hero John Paul Jones) who fights battles off the coast of England against the British and American loyalists. One of the book’s themes is the ambiguous nature of loyalty. Although often bogged down by complicated nautical terminology and intrusive philosophical dialogue, the novel is nevertheless noted for its spiritual and moral dimensions. - Summary by The Encyclopedia Britannica