Question:  Harlequin is the first novel in The Grail Quest series by an English author who  is best known for his novels about what Napoleonic Wars rifleman?
Sentence (from "Aubrey–Maturin series"): The Aubrey–Maturin series is a sequence of nautical historical novels—20 completed and one unfinished—by Patrick O'Brian, set during the Napoleonic Wars and centering on the friendship between Captain Jack Aubrey of the Royal Navy and his ship's surgeon Stephen Maturin, a physician, natural philosopher, and intelligence agent.
Relevant evidence: No