Harry finally defeats Voldemort, but only after the world has been destroyed. Harry has his vengeance, but gets pulled into Voldemort's ritual and is dragged with his body to an alternate universe.

Curiosity killed the cat, satisfaction brought it back. Harry's curiosity leads him to exploring the Chamber a bit more thoroughly before he leaves for the Summer. What he finds there gives him a new responsibility beyond just himself and a lifelong satisfaction in the choices he makes from there on.