The book has more story to it, more structure. There are flashbacks; different POVs and each other part starts off with a quote about fire. I absolutely loved that each part started this way which fits with the story because Brian is a firefighter and Jess is an arsonist (Arson is bad!). I suppose fire is kind of a metaphor in the story; Anna is named after a star and stars burn; Anna was a light; she meant hope for Kate and knew how to break the tension in the house. In the end she does save her sister....fire's will burn itself out; even without your help.
It takes some time to get into the multiple POVs, but, once you have, the story reads pretty well. There are POVs from everybody in the family, the lawyer and Julia; in the end there's one chapter from Kate. All the POVs are centered around one event/theme i.e Kate. Jesse's POV, Campell's and Julia's surprised me because I didn't really think they needed to have one. Jesse's is important, because he showcases what happens to other family members when somebody in the family has cancer or is seriously sick.
Jesse was my favorite character, unfortunately we didn't get to see the real Jesse in the movies. Jesse in the book is an arsonist, he goes around abandoned buildings and sets them on fire. He then waits for his dad ( a firefighter) to come put them out. Jesse also exhibits self-destructive behavior at a young age. He can't save his sister because they don't match genetically, so he reasons if he can't heal he should destroy. It sucks that they watered down his character in the movies.
Campbell is the lawyer that takes on Anna's case; he's a funny guy with a secret. I was amused by how he always came up with something ridiculous when people asked him what his service dog was for. Then there's Julia ( a guardian appointed to Anna ); who happens to be Campell's high school girlfriend. This leads to a romantic sub-plot I didn't really care for or thought was necessary. It eventually grows on you though, but I could have done without it.