The fifth book deals with Harry trying to make everyone else realise that Lord Voldemort has come back. Dumbledore, the Order, and Harry's friends are the only people that believe that he has returned. At the end of the book, Harry, Ron Weasley, Hermione Granger, and some of their friends go to the Ministry of Magic (the headquarters of the people who lead the magical world) because Harry thinks his godfather is in danger. It turns out it was a trick using mind magic, and his godfather (Sirius Black), is murdered by Bellatrix Lestrange. They are attacked by some of their enemies. At the end, Voldemort comes, but Dumbledore saves Harry from him, and all the other wizards see Voldemort and know Harry is telling the truth. Harry is then returned to Hogwarts where Dumbledore tells him everything that he needs to know about the prophecy and why Voldemort tried to murder him when he was a child.