Chatterbox: Inkwell

So I'm writing a vampire story. It's set in the Victorian era, and the vampires are pre-Victorian animate corpses with intellects roughly at the level of some of the stupider predators of the animal kingdom.

The vampire, Mort, is enslaved by a witch, Morgan (remember them, Admin? Don't worry I'm not gonna post any bloody exerts!) who, ah, bathes in blood in order to preserve her youth.

So they kill one Dr. Alexander Johnson's brother and best friend. He's not very happy about that, obviously.

He contacts an old friend, a vampire hunter living in the north. Not sure where exactly, but far up. Like, dunno, northern Russia, maybe?

Anyway, that's all well and good, or it would be if the vampire hunter wasn't female (the Victorian era was famously misogynistic, for those who don't know). So Johnson, who was already reclusive and withdrawn due to a prolonged period of mourning for his wife and child, who died five years previously of a violent strain of cholera, anyway, Johnson is kind of ostracized by general society when this vampire hunter shows up. (Er... this is worse than it sounds, given the time period. Social status was, like, the top priority for the middle- and upper-classes. If you were shunned by your peers you basically failed at life).

So, anyway, the vampire hunter whose name, I think, is going to be Kira, and Johnson try to hunt down the vampire and the witch. Morgan finds out about this, and is very, very, unhappy. So she decides to play cat-and-mouse with Johnson and Kira in hopes of either discouraging them, or (optimally) driving them insane.

With Kira, it kind of works. Kind of. She's going to be a bit schizophrenic to begin with, I think, so Morgan's torment is going to push her over the edge, only really it's more of a light tap than a shove, 'cause she was teetering on the edge anyway.

The point being, Kira looses it and ends up completely bonkers, talking to herself, paranoia, wild eyes, the whole nine yards. Yeah. Also I might make her convince herself that she's turned into some kind of bird. And yes, the schizophrenic "voice" that she hears from the beginning will, in fact, be my voice. So, yeah, haha, I'll basically be self-inserting myself into a crazy characters mind. Should be fun.

Anyhoo, Johnson tries to coax Kira back to sanity with limited success; sometimes he manages to get her thinking straight enough to help him continue tracking the vampire and the witch; other times she thinks he's trying to capture her and turn her into a cockroach, so she tries to strangle him on several occasions.

Meanwhile Morgan switches tactics and suddenly starts killing everyone she can find who was connected to/talked with Johnson, hoping to guilt him into stopping his obsessive search. She leaves notes and clues hidden with each body, cryptic enough to keep the good doctor perpetually confused.

The breaking point for Johnson comes when Morgan attacks and brutally murders a former patient of his, a young girl who he had treated for a severe fever several years previously. He starts to slide down into madness and depression...

And then I don't know what happens. Any suggestions?