The first one, is my former main story. I did write a screenplay for it, but for some reason I am having issues getting an actual novella or novel-type version going. At one point I had 60 pages written for a class, which turned out to be about 34, but what happened to those pages; I don't know. So now, I'm down to about 17 pages and for some reason I can't motivate myself to work on this story now, even though I have the basic storyline all written out via screenplay. Granted, the novel/novella version will vary greatly from its screenplay counterpart.
Summary of idea one: A young woman, Adele, who is a P.I. in Seattle, unknowingly suffers from split personality disorder. Her other personality, Eleda, generally comes out at night and when she does, she murders bad people (usually). Down the road, Eleda becomes emotionally unstable by the reappearance of her abusive father (who killed her mother and physically scarred her face as a child) and starts getting sloppy with her work. This sloppiness causes Adele to become a suspect of many of the murders she has worked over the years with her friend in the police department, Adrian. At first Adrian doesn't want to believe this could be true and tries to convince himself otherwise. Eventually though, the evidence becomes overwhelming and he must arrest Adele. Before he can, though, she (as Eleda) has one final run in with her father that ends in his death and her hospitalization. Shortly after gaining consciousness, Hugin (her co-P.I) tells her that she's being charged with all of these murders, they have a long talk where she realizes she has known so many things about many of the murders on a "whim" when she actually knows because she was there. She has a panic attack and the nurse kicks Hugin out. A day later she is released and as she tries to leave the hospital the police bombard the place and she has to run for it. She manages to lock herself in an elevator (she pulls the fire alarm) after grabbing some surgery equipment (scalpels etc). She is still mentally unstable from the realization of what she's done. Hugin (he's in love with her) desperately tries to convince Adrian that she's mentally unstable and needs help. As they try to locate her, she contemplates what she has done to her many victims and can't cope with the fact that she is a "monster". Before they can get to her she cuts herself up with the scalpel, but when they get close to finding her and begin to open the elevator she slices her own jugular and bleeds out too much before they can get to her.
The other ideas aren't nearly as worked out as this one and I will post as much of summaries as I can when I have them at least a little more formed. They are only in the beginning stages and I have no idea how I intend for them to play out. Besides, this post is way too long as it is. Oops!