The whole story is based around two characters, Finch and Violet, they meet on the bell tower ledge and the story continues from there. You get both points of view as it alternates between chapters, its always great to see how the other person views things and you get a more detailed view into the both of them.
It does deal with some sensitive issues like mental illness which is great for helping people understand what people are going through but if you don't want to read about things like that then I would avoid this book. There are numbers and an authors note at the end in case there's any topic you need help with.
Maybe keep tissues to hand, but please enjoy this book as much as I did,