This was an interesting read, definitely something unique - but still just 4 stars from me. It was written in the same way as all other Picoult books, flipping back and forth between viewpoints of the characters. And the subject itself, while controversial, isn't all that new (when/if to terminate life support). What it brought that was different was the backstory it told of Luke and the wolves, and how we learn a little bit about them.
Overall, it was a good read, not one of my favorite Picoult books, though. The ending did surprise me in a good way, though.