what is the 4th harry potter book

The fourth book in the Harry Potter series is called "Harry Potter and the Goblet of Fire". It was written by J.K. Rowling and was published in 2000. The book follows Harry Potter, a wizard in his fourth year at Hogwarts School of Witchcraft and Wizardry, as he competes in the Triwizard Tournament and uncovers a mystery surrounding the entry of his name into the tournament. The book is almost twice the size of the first three books, with the paperback edition being 636 pages.