In 'Harry Potter and the Goblet of Fire', 14-year-old Harry is unexpectedly entered into the dangerous Triwizard Tournament, leading to emotional challenges and tests of bravery as he competes against older students. Throughout the competition, he faces life-threatening situations, discovers the return of the dark wizard Voldemort, and grapples with the death of his fellow competitor Cedric Diggory. Ultimately, Harry returns to a difficult life with the Dursleys but retains hope for the future despite the challenges ahead.