A Scandal in Bohemia
Boswell's surname has passed into the English language as a term ("Boswell", "Boswellian", "Boswellism") for a constant companion and observer, especially one who records those observations in print. In "A Scandal in Bohemia", Sir Arthur Conan Doyle's character Sherlock Holmes affectionately says of Dr. Watson, who narrates the tales, "I am lost without my Boswell."