Rowling has won many awards for the Harry Potter series of books and has earned over $1 billion. The last book of the series, "Harry Potter and the Deathly Hallows," was released on 21 July 2007. Due to the popularity of the books, Rowling has become very wealthy. The books have sold over 500 million copies. Rowling has written many books about the magic in Harry's world, such as 'Quidditch Through the Ages' and 'Fantastic Beasts and Where to Find Them'. Additionally, she has written other books targeting adults, the first of which is called "The Casual Vacancy". "The Cuckoo's Calling" was published in April 2013, under the pen name Robert Galbraith, and its sequel, called "The Silkworm," followed in June 2014. In 2016, people made an eighth book inspired by "Harry Potter." This book was called "Harry Potter and the Cursed Child." The book was the script for a play.