The Escape Room
Now this was a book, I couldn't put down. Really, I started reading and only put it down for dinner and a nap. very suspenseful, VERY! Even though I saw the ending twist or at least part of the twist, it was quite satisfying. The secrets were revealed slowly and carefully.
Maybe because of the suspense, I felt she was too wordy in descrivbing the characters, especially their flaws, but even then, she was a master at revealing them carefully.