With the help of Professor Dumbledore, Harry uncovers the key to unlocking Voldemort's defenses and begins to prepare for the final battle. Meanwhile, a new professor of Defense Against the Dark Arts arrives at Hogwarts and a romantic entanglement develops between Harry and his friend Ginny Weasley. As Harry and his friends learn to master their craft, they must also face their greatest fears and confront the dangers of both the wizarding and Muggle worlds. With the fate of the world hanging in the balance, Harry must make the ultimate decision between what is right and what is easy.