Stephen Fry hasn't disappointed yet! This book is so full of mystery--intrigue. Everyone is keeping secrets from Harry, and while they believe it's for his own good, it never is! They all praise him as the "Boy Who Lived" and then treat him with kid gloves. And in the end, it always does more harm than good, because he ALWAYS finds out! Harry usually finds out in the worst way and it's never the full story. Then he flies off half-cocked.
In the end he finds new allies, and while he's heart broken that they weren't able to clear Sirius, there's hope that they will eventually. And now he knows that someone that his parents loved and trusted is there behind the scenes looking out for him.
The sad part is that this is the end of that little bit of innocence the trio are clinging to. After this, it gets really dark and just gets worse and worse until the climax.