Which J.K. Rowling novel introduces the Triwizard Tournament at Hogwarts?

Harry Potter and the Goblet of Fire introduces the Triwizard Tournament at Hogwarts.

Published in 2000, the fourth Harry Potter novel brings together three wizarding schools for a dangerous magical competition. Traditionally, one champion is selected from each school, but Harry is unexpectedly chosen as a fourth champion after his name emerges from the Goblet of Fire.

The tournament consists of three tasks involving a dragon, an underwater rescue, and a maze. Its story begins as a school spectacle but becomes central to the return of Lord Voldemort. Readers sometimes associate the tournament mainly with the film adaptation, yet it originates in Rowling’s fourth novel. The book also marks a major shift toward darker themes and wider political consequences.