Thank you to everyone who's replied... Here's a bit more info to help people decide.
The killing aspect is part of the storyline, not just to get our rocks off. This will be on the EX board, afterall. It's setting up a later storyline, so really needs to be in there. Ideally, a few people will play multiple roles. There will be set up and struggle, but with the understood that in the end - it will be the end.
Then, after, say, ten or so of those shorter stories, we'll continue onto the main SL, about the people tracking down the killer. OR, we can do that SL right from the start, and have the other scenes interspersed throughout.
He/they (it isn't known) would target random women. Stalk, then abduct or otherwise take. The methods will vary, as will the sexual nature of each attack. You will control who the women are and how they react to things.
If anyone has any more specific questions, throw 'em at me. Thanks again!