Usage and Grammar

Q. Is it an historical novel or a historical novel?

A. In Chicago style, it’s a historical novel. Please see CMOS 5.72: “With the indefinite article, the choice of a or an depends on the sound of the word it precedes. A comes before words with a consonant sound, including /y/, /h/, and /w/, no matter how the word is spelled {a eulogy} {a historic occasion} {a Ouachita tribe member}. An comes before words with a vowel sound {an LSAT exam room} {an X-Files episode} {an hour ago}.”