Harry Potter and the Cursed Child: Parts One and Two

Warning to all Harry Potter fans (books and movies): this book opens wounds you might thought have healed!
At first it read like a typical hp-fanfiction, and I laughed a lot, but then again I cried almost more than I did while reading book seven!
It's not book one to three, which are my favourite of the series, but it's high up there with them.