Harry Potter and the Order of the Phoenix is the fifth book in the "Harry Potter" series by J.K. Rowling. The book was released on 21 July 2003. It is about Harry's his fifth year at Hogwarts school of Witchcraft and Wizardry. Lord Voldemort has come back. Except for Albus Dumbledore, most people do not believe him. A movie based on the book was released in 2007.