There are two books, one story. The first one is Somewhere Between Life and Death and its...Not great. It's good, but there's not that much to it. The story is very one dimensional. It's done well, I suppose, but most of the time it just didn't make you feel much, despite the heavy subject matter. It felt like the whole book you were just sitting around in that hospital. Still, nothing about it particularly annoyed me, so I guess I would still recommend it.
Far better was Time to Let Go. I don't know why, but I always seem to like it in books when the main character has a problem, like they always get headaches. I know that's a weird thing to like, but I always find it intriguing. This book had a lot more to it: grief, therapy, and even a love interest. And West Side Story! Kinda. I love David and Erin's relationship in this book and how there's a lot more progression in this one than the last one.
Bottom line: it doesn't take long to read these two books, so if the idea of them intrigues you, go ahead. It's not the best book that I've ever read, and I probably won't read it again, however I have already read it twice, so you never know.