Serenity by Keith R.A. DeCandido 1 September 2005 by librarian 0 “Serenity” by Keith R.A. DeCandido. Title: Serenity Series: Firefly Author: Keith R.A. DeCandido Language: English Publisher: Pocket Star Books Published: September 2005 ISBN-10: 1416507558 ISBN-13: 9781416507550