Which J.K. Rowling novel was published on 21 July 2007?

Harry Potter and the Deathly Hallows was published on 21 July 2007.

It is the seventh and final novel in J.K. Rowling’s original Harry Potter series. The book follows Harry, Ron Weasley, and Hermione Granger as they leave Hogwarts to find and destroy the remaining Horcruxes connected to Lord Voldemort.

The publication became a major global event, with midnight release celebrations and very high advance sales. In the United Kingdom, Bloomsbury published the book; Scholastic published the U.S. edition. The story concludes the main conflict and reveals the significance of the Deathly Hallows, three legendary magical objects.

The book’s film adaptation was divided into two parts, released in 2010 and 2011. That split explains why the seven-novel series became an eight-film series.