In the fifth installment of the Harry Potter series, Harry must contend with the return of Voldemort and the denial of the Ministry of Magic, who refuse to acknowledge the Dark Lord's return. Frustrated and angry, Harry forms a secret organization of students to teach them defensive magic against the impending threat of Voldemort and his Death Eaters. But as Harry becomes more obsessed with the truth, he finds himself isolated from his friends and increasingly vulnerable to Voldemort's influence.