Princess Luna is mysteriously found dead in her bedchambers, with no clues pointing to it being a murder. Naturally the citizens of Equestria are deeply distraught to find out about their leader's demise, but nopony is more upset about it than the bat ponies, creatures of darkness who few Equestrians know of, and even less have seen.

When a group of them band together to find out the truth, how much will it take to find the answer?

And what will happen if they do?