Loopy Lupin

I've been reading the third book in the Harry Potter series: Harry Potter and the Prisoner of Azkaban. In an effort to keep my devotees fulfilled, I'll attempt to forecast what happens.

I'm currently almost half way through the book. Thus far, Sirius Black - the prisoner of Azkaban who epsconded - has somehow made it into Hogwarts. A few questions loom:

1. Who exactly is he and what did he do? The word on the street is that he wanted to be second in control after you-know-who. Moreover, he wants to kill Harry Potter. It is clear that he does not kill Harry Potter - that would end the series. Unfortunately, I also know that Black appears in later books - so, what happens to him in this book? I'm utterly confuzzled on the matter.

2. Who let Black into Hogwarts? Professor Severus Snape alluded to the new Professor Lupin. I think there might be something there. While demonstrating the boggart to his students, Lupin did not allow Harry to participate because Lupin feared the boggart would turn into you-know-who as it takes the form of the person its victim is most fearful of. So, my conjecture is that you-know-who resides in Lupin and that if Harry had been allowed to participate, the Boggart would have turned into Lupin. The irony, though, is that Harry does not fear you-know-who, but rather he fears the dementors. Lupin had simply assumed that Harry heard the dark one.

3. So, what about Lupin? I think he will be destroyed by the end of this book.

That's all for now!