In which Harry Potter goes horcrux hunting, Voldemort rediscovers the wonders of being a teenager, and a wizard hitman chases the unlikely duo across Wizarding Europe.

In a slight alteration of events, Voldemort is the one to try and kill Cedric Diggory in the graveyard and that marks the beginning of the end. Or, in which Cedric Diggory finds himself harboring an illegal horcrux in his head, and Tom Riddle's ego cannot handle more than one Dark Lord terrorizing the world at a time, even if it's himself.