J. K. Rowling may have ended Harry's adventures years ago but the magical world continues to spurn stories. The author's publisher has announced that there are two new "Harry Potter" books in the works and they will be released this fall.

New books to be released in celebration of series' 20th anniversary

Bloomsbury announced that Rowling will be expanding the wizarding universe with the addition of two new in-universe books. "Harry Potter: A History of Magic - The Book of the Exhibition" and "Harry Potter - A Journey Through a History of Magic" has been scheduled to release this October.

Pre-orders for the said two novels are now available.

Rowling has opted to publish the book this fall to coincide with the opening date of the "Harry Potter" exhibition at the British Library, which will be on October 20. The event was put up to mark the 20th anniversary of the first novel of the series, "The Philosopher's Stone." The said event will be up and open to the public until February next year.

Experience Hogwarts through the new books

Bloomsbury revealed that "A History of Magic - The Book of the Exhibition" will showcase a collection of various treasures and artifacts from the series, which will also be displayed at the British Library during the exhibit. It will also include exclusive sketches, manuscripts, and illustrations from the archives of the novel series.

Meanwhile, "A Journey Through a History of Magic" will give avid readers of the series to study the various subjects offered at the fictional Hogwarts School of Witchcraft and Wizardry. It will be a textbook full of lessons discussing various subjects such as Astronomy, Divination, Herbology, and even the intriguing Defense Against the Dark Arts.

The two new books are Rowling's latest additions to her supplementary works for the Harry Potter universe. The final novel titled "The Deathly Hallows" was released in 2007. Nine years later, a book about the stage play by Jack Thorne, which was inspired from the conclusion of the series, was released.

The adventures of the main characters may have ended a decade ago but Rowling keeps readers in touch with the magical world by releasing related books.

She has already published "Fantastic Beasts and Where to Find Them", a textbook used in Hogwarts, which was eventually adapted into a film series. She also released "The Tales of Beedle the Bard" and "Quidditch Through the Ages."