Higurashi no Naku Koro Ni
that's the obvious answer anyway.
Personally I like "Another" way better. (confusing name isn't it?)
Mystery, Deception, and tragedy wrapped into a neat little ball of death.
AMV has spoilers but I like to leave a video of the anime to give a glimpse of it.
http://www.youtube.com/watch?v=PbWuhgqX4vY
