All the Bright Places

I dont read the book but judging from the movie itself, I like the movie, I'm getting the message about all the mental health illness and how important is it to seek help before everything is too late. The scene, the mood, the tone of the movie are all very nice, it got us to the mood, but really the character development sucks big time, I just don't quite get it with Finch's past, and Violet's relationship with her sister, a flashback in the past would really get us better help in knowing the characters better.