I posted this to AbeBooks' "BookFinder," to no avail so far. I'm looking for a scary story I read as a kid. I can only remembering the most oblique facts about the plot, but here goes:
The sister of the narrator (and/or viewpoint character), a young boy, has just died, but the narrator knows that, in fact, the Moon (yes, the Moon) came in and killed her. The boy goes to look for her but is terrified of the moonlight streaming in through the window. There's a scene about the Moon laughing, or something like that. There's also a scene in which the Moon's rays are compared to a knife, and a description of blood. (Yes, I know how vague all those comments are.) It terrified me when I was little--it had something of the feel of an evil fairy tale, if that makes any sense.
It is not Patricia Windsor's "Moon Kill," though that is similar.
Thank you all!