The Body in the Library [Agatha Christie]
I liked this book more then the first, although I think I preferred the first books same POV instead of this one which jumped around some. Another big difference between the two is that this one has the murder mystery almost from the start while the first book has no mystery until about half way through. I've given up trying to follow Miss Marple's thought process, since I always get lost until the end when she explains.