Decent book, but I read it WAY too young (in 6th grade at 11 years old). It taught me things about sex and heroin that I never could have imagined prior to this book. It also taught me what Xeroderma Pigmentosum is though, so a win is a win I suppose.
On re-reading as an adult, I still found it to be a very good book, and extremely well written, though it's hard not to hate the main character, Anna. Graver does a great job making us feel as empathetic towards Anna as is possible -- I understand that having a medically complex child, especially one with a disease that is likely to be terminal, is VERY difficult, both for the child and for the child's parents and siblings. But Anna had an affair and tore her family apart in the interest of simply being completely selfish and self-serving. She had a wonderful husband who was a great father to their children and provider of their family, and she ruined that for all of them because she was feeling like she'd lost herself. Which is fair, for her to FEEL that way, but acting on it in that manner was disgusting and not okay on any level.
Worse yet, the man she has the affair with is the owner and proprietor of the camp that they attend for their son Max in the summers, the ONLY place where Max can live like a normal child with other people like him, and Anna ruins that for him. The whole book she chastises her husband Ian and older son Adam for them apparently not understanding how important the camp is, both for Max and for their whole family, and then she sabotages the one place Max could feel normal. Again, I feel for her up to that point, I understand how unbelievably difficult it was for her and Ian to give up their dreams and passions for their life to revolve around their sons, who live such completely opposite lives due to Max's illness, but imagine how it is for Max and Adam! Ian didn't complain or abandon his family, nor did most of the other parents of the XP kids at the camp, but Anna did, and I really feel like that is unforgivable under these circumstances.
Hal is also to blame for making the camp no longer a safe space for Max, and potentially for the other parents and children who became aware of he and Anna's affair. I think Hal cared about Anna more than she cared about him, in that he was falling in love with her and asked her to move to be with him instead of Ian, but he is extremely selfish and self-serving too. Asking her to split up her already (by that point) broken family just so they could be together, which would also impact the friendship his daughter Alida and Max had formed was an insane suggestion, and not one made out of love. However, Anna is downright cruel to Hal on more than one occasion, and is much more wishy-washy and hot/cold regarding him and their affair than he is.
This book is definitely worth the read, in my opinion, for how well written it is, and the very unique setting and storyline revolving around kids (and some adults) with XP, but be prepared to hate Anna and possibly Hal too by the end of it. I am tempted to write a piece of fanfiction continuing the story and giving it a "better" ending.