Nico di Angelo and the Goblet of Fire

Nico made it out of Tartarus, helped defeat Gaea, and true to his word he's avoiding all other demigods. Now the Triwizard Tournament is at Hogwarts, and Percy and the Hecate cabin have managed to find a way to come and watch. With foreign students everywhere and a paranoid ex-auror for a teacher, Nico finds maintaining his exile and his cover more challenging than he thought.