Darkness has settled over Hogwarts. After Dementors attack his cousin Dudley, Harry knows Voldemort is gaining power and will stop at nothing to reach him. Many refuse to believe the Dark Lord has returned, but Harry isn’t alone. At Grimmauld Place, a secret group forms to resist the growing threat. As Voldemort begins invading Harry’s thoughts, he must learn Occlumency from the reluctant Professor Snape — before the dark magic inside his mind becomes too strong to control.
