I read a review of All Unquiet Things that said I wouldn't be able to put it down, because the mystery was so compelling. That was not my experience. I liked the book, but I never felt any sense of urgency, and the ending was--I don't know, you know on television crime shows, at the end, the police show up just in time to avert another murder? And you expect that from television crime shows, so it usually doesn't feel too ZOMG-eyeroll-contrived? I don't expect it from books (maybe I should? I don't read many mysteries...), so yes, with the eyerolling.
Anyway, I was invested in the characters, interested in the storyline, but the ending was not to my satisfaction. And I think it got off to a slow start, although I'm not really sure how that's possible. I didn't care about the who-dunnit aspect until maybe 150 pages in.