I usually never read fantasy books nowadays, and go more into deeper books about finance & leadership. But, I'm willing to make an exception for the hepatology of Harry Potter. To all the J. K. Rowling fans out there, this is awesome.
This series is about a young boy named Harry Potter, who discovers that he is a wizard at the age of 11. As he learns about his new powers at a magic school, Hogwarts, he meets new friends (Ron & Hermione) and faces off against the most evil dark wizard of all time, Voldemort.
Being one of the best writers in existence, J. K. Rowling has a certain way of committing to making Harry Potter look just like a normal teenager with magic in his blood, rather than making him some kind of psychic weirdo. I absolutely love it. This is a brave decision from Rowling, and she managed to pull it off, because I can tell you from first hand experience, grown up's do not possess the ability to think like teenagers.
As for the series itself, all the books coordinate with each other so well if read in the correct order. If you pull off the best decision and read all of the books without interruption, I can guarantee that it'll be the best series you've ever read. Rowling even makes magic look like something that you're supposed to have by the end of the series.
Overall, I definitely recommend not buying just one, but the whole hepatology of Harry Potter. Trust me, the money's definitely worth it.