Harry Potter
Voldemort returns

In Harry's fourth year of school (detailed in Harry Potter and the Goblet of Fire), Hogwarts hosts the Triwizard Tournament, a contest between Hogwarts and the schools Beauxbatons and Durmstrang. Harry is unwillingly entered into the contest, becoming Hogwarts' second participant after Cedric Diggory, an unusual occurrence that causes his friends to distance themselves from him. Harry claims the Triwizard Cup with Cedric, but he is teleported to a graveyard where Pettigrew kills Cedric, then resurrects Voldemort using Harry's blood. Voldemort convenes his supporters, the Death Eaters, and Harry manages to escape after a duel with Voldemort. Upon returning to Hogwarts, it is revealed that a Death Eater, Barty Crouch, Jr, in disguise as the new Defence Against the Dark Arts professor, Alastor "Mad-Eye" Moody, engineered Harry's entry into the tournament, secretly helped him, and had him teleported to Voldemort.

In the fifth book, Harry Potter and the Order of the Phoenix, the Ministry of Magic refuses to believe that Voldemort has returned. Dumbledore re-activates the Order of the Phoenix, a secret society to counter Voldemort; meanwhile, the Ministry tightens control of Hogwarts by appointing Dolores Umbridge as High Inquisitor of Hogwarts, and she gradually increases her powers. When Umbridge bans practical teaching of Defence Against the Dark Arts, Harry, Ron and Hermione form " Dumbledore's Army ", a secret group to continue the teachings. Harry has recurring dreams of a dark corridor in the Ministry of Magic, eventually dreaming that Sirius is being tortured there. He races to the Ministry with his friends, but it is a trap, planted in his head by Voldemort. The group are attacked by Death Eaters and saved by the Order of the Phoenix, but Sirius is killed in the battle. A duel between Dumbledore and Voldemort convinces the ministry of Voldemort's return. A prophecy concerning Harry and Voldemort is revealed: one must die at the hands of the other.

In the sixth book, Harry Potter and the Half-Blood Prince, Snape teaches Defence Against the Dark Arts while Horace Slughorn becomes the Potions master. Harry finds an old textbook with annotations by the Half-Blood Prince, due to which he achieves success in Potions class. Harry also takes lessons with Dumbledore, viewing memories about the early life of Voldemort in a device called a Pensieve. Harry learns from a drunken Slughorn that he used to teach Tom Riddle, and that Voldemort divided his soul into pieces, creating a series of Horcruxes. Harry and Dumbledore travel to a distant lake to destroy a Horcrux; they succeed, but Dumbledore weakens. On their return, they find Draco Malfoy and Death Eaters attacking the school. The book ends with the killing of Dumbledore by Professor Snape, the titular Half-Blood Prince.

In Harry Potter and the Deathly Hallows, the seventh and final novel in the series, Lord Voldemort gains control of the Ministry of Magic. Harry, Ron and Hermione learn about the Deathly Hallows, legendary items that lead to mastery over death. The group infiltrates the ministry, where they steal a locket Horcrux, and visit Godric's Hollow, where they are attacked by Nagini, Voldemort's snake. A silver doe Patronus leads them to the Sword of Gryffindor, with which they destroy the locket. They steal a Horcrux from Gringotts and travel to Hogwarts, culminating in a battle with the Death Eaters. Snape is killed by Voldemort out of paranoia, but he lends Harry his memories before he dies. Harry learns that Snape was always loyal to Dumbledore, and that Harry is himself a Horcrux. Harry surrenders to Voldemort and is killed. The defenders of Hogwarts continue to fight on; Harry is resurrected, faces Voldemort and kills him.

An epilogue titled "Nineteen Years Later" describes the lives of the surviving characters and the impact of Voldemort's death. Harry and Ginny are married with three children, and Ron and Hermione are married with two children.
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