"Harry Potter" author J.K. Rowling is set to release three new books connected to the Hogwarts universe, with the tomes to be published as eBooks next month, according to NME.

The three collections of Harry Potter stories are now available for pre-order via Amazon and will be out for purchase from September 6, for approximately $3.33 each.

The first book is "Power, Politics And Pesky Poltergeists", which will reportedly give "a glimpse of the darker side of the wizarding world", including the history of Azkaban prison; while the second book "Heroism, Hardship And Dangerous Hobbies" is set to include tales from heroic characters including Remus Lupin and Minerva McGonagall, as well as Sybill Trelawney and Silanus Kettleburn.

The final book, "Hogwarts: An Incomplete And Unreliable Guide", centers on the school which Potter, Hermione Granger and Ron Weasley attended while learning magic.