I regret to say that at age 15 I have read the third Harry Potter book. The regret is not reading it, the regret is not having read it sooner. This book features Ron, Harry and Herimone in their third year of Hogwarts while an escaped felon 'Sirius Black' is on the loose and turns out, he's looking for Harry.
This is the only book not to feature He-Who-Shall-Not-Be-Named, however he is mentioned by Peter Pettigrew, Harry himself and many others. This has to be my favourite so far because the love between Harry and Sirius towards the end is wonderful and heart wrenching. ALso I somewhat sympathise with Herimone with the school work- though I'm not in possession of a Time Turner just yet!
The writing style is yet again phenomenal, as expected of Miss Rowling.
Absolutely loved it, finishing it around 1am was a good choice.