The novel was released at the end of January 2015 by Avon. Quinn does carry through other plot points from the first three books, notably the unicorn obsession of Lady Frances. Unlike the prior three novels in this quartet, The Secrets of Sir Richard Kenworthy did not focus on the effects of a duel which occurred before the setting of the first novel. According to Julia Quinn's website, the opening scene of this novel also appeared in her novel It's In His Kiss, as well as the previous books in this series, Just Like Heaven, A Night Like This, and The Sum of All Kisses. The musicale, often described in prior books as an assault on the ears, had been mentioned in multiple Quinn books, beginning with her third novel, Minx. The series features participants in the annual musicale hosted by members of the Smythe-Smith family. Her twenty-fourth novel, The Secrets of Sir Richard Kenworthy, is the fourth and final book in Julia Quinn's Smythe-Smith Quartet. Characters from one novel are often mentioned in others. She specializes in Regency romances, and her novels share a fictional universe. Julia Quinn is one of only 15 writers inducted into the Romance Writers of America's Hall of Fame. The novel reached number 2 on the New York Times Bestseller List and was in the top 10 for the USA Today bestseller list. It features Iris Smythe-Smith and the eponymous Sir Richard Kenworthy. Quinn's 24th novel is also the final installment of her series known as the Smythe-Smith Quartet.

The Secrets of Sir Richard Kenworthy is a Regency romance written by Julia Quinn and published in 2015 by Avon Books.

The secret of sir richard kenworthy