Narrating the story from the POV of a ghost/comatose person was a really unique idea that I think Rosamund Lupton pulled off quite well. It's hard to do well, and I never love the storytelling style, but it was well written here. I actually found myself invested in their story despite their somewhat passive roles. There were a lot of interesting plot points and twists along the way. This didn't have the final twist of Sister that really made that book great for me, but I thought it was a pretty good thriller that I'm glad I read.