Harry Potter and the Order of the Phoenix is the fifth book in the Harry Potter series by J.K. Rowling.
In this book, Voldemort has returned to the world in full power (he did that at the end of the fourth book, so I hope I didn’t spoil it for you). Harry Potter has a godfather now who he can hang around with (Sirius Black went into hiding at the end of the third book, so he couldn’t be around for much of the fourth book).
Now, you’re probably thinking, “How can J.K. Rowling possibly write three more books in the series (since there are supposed to be 7 years of schooling at Hogwarts) with Voldemort back?”
Here is how she did it.