The Book Design Review has offered up their top book designs of the year, which you can even vote on on their website. The front runner, and my favorite, is Columbine, which has a desolate, 28 Days Later feel and gives off an austere, unsentimental, Scandinavian vibe.
At the same time, due to its light color scheme and its abundance of sky, there's something dimly hopeful about the cover to me. There's an ambiguity that tells me this is not going to be an ordinary, sentimental true-crime book, and when you stop to think about the subject matter, that's no small feat on the part of its designer, Henry Sene Yee. If the many stellar reviews it has garnered are correct, this is one book you can judge from its cover.