Netflix’s blockbuster show, Bridgerton, has led to renewed demand for the Regency-era novels by Julia Quinn that form the basis for the eight-episode program. Netflix released Bridgerton on December 25 and since that time, HarperCollins’s Avon imprint reports that it has sold a total of 750,000 copies of books from the series, including 285,000 copies last week.

The official tie-in to the show, The Duke and I, is available in mass market, trade paperback, and e-book editions. Although Avon did not break out sales by format, the digital edition of The Duke and I, as well as e-book editions of the other titles in the series, appear to be driving sales.

The Bridgerton books have also been riding high on the Apple e-book bestseller list, taking seven of the top 10 spots on its most recent list. As of this morning,, the series had nine titles among Amazon’s top 25 bestselling e-books.

The series, and The Duke and I in particular, are also doing well in audio. RBmedia said it has seen a “surge” in sales of all Bridgerton titles since the television series was released, and The Duke and I is currently its top-selling audiobook.

Bridgerton readers and retailers also received more good news yesterday. Netflix announced it will soon begin production of a second season of the show, which will be based on the second book in the series, The Viscount Who Loved Me.