I usually don't mind a predictable ending as long as the story is decent but it was a little ridiculous that I guessed both the killer and the motive within the first couple of chapters. There were so many POVs that it was hard to track, and the writing lacked any depth whatsoever. Every sentence was "(person) thought about who killed Diana. (person) felt terrible about what happened to Diana. How could something like this happen to such a great person?" Just nonstop telling telling telling. The story was compelling enough but it was a very mid book.