In order to avoid a lengthy prison sentence, a baobhan sith agrees to work with an anti-vampire organization whose sole mission is to protect citizens from things that go bump in the night.

I am intrigued by the premise. But I had to google “baobhan sith”. (I’m better versed in classical mythology than pop mythology.) I don’t know how much of a stumbling block that would be to Hollyweird types reading the logline. You may want to tweak:e. “A baobhan sith, a female vampire, agrees…”

And why not up the ante to a death sentence by exposure to sunlight rather than a lengthy prison sentence

So:

To avoid capital punishment (death by exposure to daylight) a baobhan sith, a female vampire, must work with an anti-vampire organization to protect citizens from things that go bump in the night.

But then, I got to thinking: if you’re to up the ante of her punishment, that entails a commensurate upping the ante (risks and stakes) of her “probationary public service”. Something like she must cooperate in hunting down, incarcerating and killing if necessary rogue vampires who are a lethal criminals. Like she once was.

So then I got:

To avoid capital punishment (death by exposure to daylight) public enemy #1, a baobhan sith, a female vampire, must work for a government program to capture other vampires of her ilk and infamy.

Ramdomly associating. But I suggest you pour on the barbecue sauce and turn up the heat.

You already have a fascinating character + an intriguing situation, a strong two-fer. Go for a three-fer? Well, the three-fer you posted is a not only longer, but a little awkward. And if it’s a ‘secret’, my gut reaction is to save the reveal for the pitch.

fwiw