Deathly Hallows

Following Dumbledore's death, Voldemort completes his ascension to power and gains control of the Ministry of Magic. Harry, Ron, and Hermione leave Hogwarts to hunt and destroy Voldemort's remaining horcruxes. They isolate themselves to ensure their friends and families' safety. They have little knowledge about the remaining horcruxes except the possibility that two are objects once belonging to Hogwarts founders Rowena Ravenclaw and Helga Hufflepuff, and the third may be Nagini, Voldemort's snake familiar. The whereabouts of the two founders' objects is unknown, and Nagini is presumed to be with Voldemort. As they search for the Horcruxes, the trio learn more about Dumbledore's past.

Harry, Ron, and Hermione recover the first horcrux, Salazar Slytherin's locket, by infiltrating the Ministry of Magic. Under the object's evil influence and the stress of being on the run, Ron leaves the others. A mysterious silver doe leads Harry to the Sword of Godric Gryffindor, among the few objects able to destroy Horcruxes. When Harry attempts to recover the sword, the horcrux attempts to kill him. Ron reappears, saving Harry and using the sword to destroy the locket. Resuming their search, the trio continually encounter a strange symbol, which an eccentric wizard named Xenophilius Lovegood tells them represents the mythical Deathly Hallows. The Hallows are three sacred objects: the Resurrection Stone, with the power to summon the dead to the living world; the Elder Wand, an unbeatable wand; and an infallible Invisibility Cloak. Harry learns that Voldemort is seeking the Elder Wand, but is unaware of the other Hallows and their significance. Harry decides that finding Voldemort's horcruxes is more important than procuring the Hallows. They break into a Death Eater's vault at the Wizarding Bank Gringotts to recover another horcrux, Helga Hufflepuff's cup. Harry learns that another Horcrux is hidden in Hogwarts. Harry, Ron, and Hermione enter the school and find the Horcrux, the Diadem of Ravenclaw, and destroy the cup and the diadem.

Voldemort and his followers besiege Hogwarts. Harry, Ron, and Hermione, their allies, and various magical creatures defend Hogwarts. Several major characters are killed in the first wave of the battle, including Remus Lupin, Nymphadora Tonks,Fred Weasley, and Severus Snape. Harry discovers whilst viewing the memories of Severus Snape that Voldemort inadvertently made Harry a horcrux when he attacked him as a baby and that Harry must die to destroy Voldemort. These memories also confirm Snape's unwavering loyalty to Dumbledore and his role as spy in Voldemort's camp. Harry surrenders himself to Voldemort, who casts the Killing Curse at him, sending Harry to Limbo-like state between life and death. There, Dumbledore explains that when Voldemort used Harry's blood to regain his full strength, it protected Harry from Voldemort harming him; the Horcrux inside Harry has been destroyed, and Harry can return to his body despite being hit by the Killing Curse. Harry returns, the battle resumes, and after the last horcrux is destroyed, Voldemort is killed, and the wizarding worldlives in peace once more.

The novel, the last in the series, closes with a brief epilogue set nineteen years later, in which Harry and Ginny Weasley are a married couple with three children: James Sirius, Albus Severus, and Lily Luna. Ron and Hermione married and have two children, Rose and Hugo. The families meet at King's Cross station, where a nervous Albus is departing for his first year at Hogwarts. Harry's godson, Teddy Lupin, is found kissing Bill and Fleur Weasley's daughter Victoire in a train carriage. Harry sees Draco Malfoy and his wife (revealed on Rowling's website behind the door as Astoria Greengrass) with their son, Scorpius. Neville Longbottom is now the Hogwarts Herbology professor and remains friends with the two families. Harry comforts Albus, who is worried he will be sorted into Slytherin, and tells his son that one of his two namesakes, Severus Snape, was a Slytherin and the bravest man he had ever met. He adds that the Sorting Hat takes one's choice into account, like it did for Harry. The book ends with these final words: "The scar had not pained Harry for nineteen years. All was well."

[Credit: Wikipedia]