Muggles everywhere went into mourning when Harry Potter and the Deathly Hallows brought to a close the story of the world's most loved wizard in 2007.

Now, nearly 10 years later, author J.K. Rowling has announced a new book which will follow the next generation of characters as they set off for Hogwarts.

In a post on her website, Rowling said the novel, Harry Potter and the Cursed Child, would be available both online and in print on July 31.