Harry Potter and the Goblet of Fire

On the fourth novel, the director, Albus Dumbledore, announced that the Triwizard Tournament would be hosted in Hogwarts. One student from each magical school would be chosen by the Goblet of Fire. The champions chosen by the goblet were Fleur Delacour from Beauxbatons, Viktor Krum of Durmstrang, and Cedric Diggory of Hogwarts. Mysteriously, Harry is also chosen, even though he did not submit his name.

In the first of the three tasks of the Triwizard Tournament the champions should collect a gold egg which was guarded by a dragon. Harry was helped by professor Moody and Hagrid so he could collect the egg. The second task consisted on saving from the lake a person who was the most important one for them. Harry finished last because he rescued Ron and Gabrielle because Fleur didn’t come to save her, so finally, Harry gained some points for 'moral fibre'.
The third and final tournament task involved navigating a labyrinth filled with magical obstacles. Harry and Cedric touched the Goblet of Fire at the same time and  it turned out to be a portkey that transported the to a graveyard. There, Pettigrew and a deformed Voldemort were waiting for Harry. Pettigrew killed Cedric and tied Harry to Riddle tombstone. He then used a bone from Voldemort's father's grave, some of Harry's blood, and his own cut-off hand in a magical ritual that restored Lord Voldemort to a new body.
Voldemort revealed that a servant in Hogwarts had helped him to make Harry participate on the Tournament, to win it and to go to the graveyard. Them Harry tried to desarm Voldemort at the same time that he threw the Killing Curse to Harry. Since the wands were twins, the two spells met and interlocked, causing a bond between the wands that displays the "echoes" of Voldemort's most recent victims, including Frank Bryce, Cedric, Bertha Jorkins, James Potter, and Lily Potter. The echoes provided protection to Harry, allowing him to escape with Cedric's body and left Voldemort behind in a rage.
Harry, with Cedric’s body, returned to Hogwarts. There, professor Moody took him with him and revealed that he was Voldemort’s servant. Dumbledore, McGonagall and Snape discovered Moody and stopped him. They made Moody drink Veritaserum so they discovered that he wasn’t Moody, he actually was Barty Crouch Jr who was smuggled out of Azkaban and was using a Polyjuice Potion to impersonate the real Alastor Moody. 
Finally, Harry and Dumbledore tried to convince the Minister of Magic about the returned of Voldemort but he didn’t believe them.


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