Book report on Harry Potter and the cursed child

This book was about what happened twenty years after the last Harry Potter movie. It was a great book to read but l would highly recommend you to watch all of the previous Harry Potter movies first in order to fully understand this last book. There were about six settings in the book but the main setting was at Hogwarts. The summary of the story is that Harry Potter's son, Albus and Draco Malfoy's son, Scorpius go back in time to save Cedric before he gets killed by Voldemort. But in doing so, they have problems in the present time. The boys eventually come to a realization that they can't save Cedric. All and all, the whole book was pretty interesting and I loved it. Now, my mom says I have to read a serious book.