Cedric is killed by Wormtail using Voldemort’s wand. Voldemort is restored to his body in an ancient ceremony (GF32). The Death Eaters are called back to him and they gather (GF33). Voldemort and Harry then duel, and Harry manages to escape with Cedric’s body (GF34).
Back at Hogwarts, it is revealed that Barty Crouch Jr., impersonating Moody all year, led Harry to Voldemort (GF35).