I've read all Harry Potter books. Among all the books I loved this one the most. The ONLIEST reason is: SIRIUS BLACK! In real means, Harry had no one in his life who loved him and cared him just like a guardian before Sirius came. When Sirius Black was proved innocent and he asked Harry if he wanted a new home, that moment will be one of the most memorable moment of my life. I was crying due to happiness thinking that Harry finally got a person who will always be there for him.