Harry Potter and the Two Secrets

Sequel to Harry Potter and the Time-Turner. A cryptic note from his future self warns Harry not to destroy the Time-Turner he got from Dumbledore in 1974. Armed with the knowledge that he is a Horcrux, Harry is forced to grow beyond his years and form an unlikely alliance with Professor Snape. And then, just when he's about to die, he is thrown into the past for the final time ...