Three new e-books of Joanne Rowling about Harry Potter's Universe were published on Tuesday, September 6.

As Boston Globe reported, they are sold at the thematic website Pottermore and retailers.

The collection “Power, Politics And Pesky Poltergeists” is devoted, in particular, to professor Dolores Umbridge, and also the relations of professor Horace Sliznort with future Voldemort in Hogwarts. It also has information about the Ministry of Magic and of Azkaban prison.

The collection “Heroism, Hardship and Dangerous Hobbies” tells about Minerva Mcgonagall and Remus Lupin.

Collection of “Hogwarts: An Incomplete and Unreliable Guide” will allow Harry Potter fans to learn about secrets of the well-known school.