The third sentence,
Nathan said, "I'm really sorry. . . "
It depends what that ‘something’ is, if it’s really important then yes, point it out so you don’t forget it later. If it’s something small then there is little to no need to say it
I have never read the book before, but I have done a book review. Two ways to start off a book review is to start it off with a quote or even a question. There are other ways to start it off but those are just my suggestions. Also, be sure to include the book title and author's name.
Within the book review itself, you should summarize what the book is about. Be sure to not spoil anything though. Feel free to add some humor into your book review and a rating. For example, I did my book review on All The Bright Places and said something like "I rate this book 5 Violets out of 5 Violets." (Violet is one of the main characters in the book.)
I hope I helped you in some way!
