Well….

In order to find relief from her own demons, the schizoaffective daughter of a notorious serial killer helps the FBI to catch another serial killer who is copy-catting her father?s sadistic methods.

Problems/issues:

You have to assume no one is going to know what “schizoaffective” means. They are going to confuse it with schizophrenia. Or any other clinical term. So, I’m tempted to suggest “mentally disturbed”.

‘another serial killer’

I selected that phrase because how do they know it’s a man? Could it be a woman? (In terms of crime data, the very long odds are that it’s a man. But if you can construct a credible final twist/reveal that it’s a woman, that’s a definite plus factor in the plot to my demented way of thinking.)

‘find relief from her own demons’

In real life (as opposed to reel life)–not likely. Gone are the days when films purvey the Freudian notion that ghosts of past trauma can be exorcised by talking or some other therapeutic method. So WHY she gets involved — what her final subjective goal is — may need some thought.

But it is credible that she could be lucid enough to realize from, say, watching news stories on the TV that a serial killer is copy-catting her father’s m.o. — realizes it before the FBI does.

And, of course, if you go with that angle, they don’t believe her at first — she’s a “nut case” after all.

Potential:

On the basis of what I have read and observed of psychological disorders and psychopathology, I think it’s an interesting premise to make the protagonist a person afflicted with a mental illness.

But it’s a challenging one. Best wishes with your concept.

Yes, it’s confusing. Who is the protagonist, the sheriff or the runaway slave?

And then there’s the matter of potentially inconvenient historical facts.

Pro-slavery partisans had lost the battle by 1858, when an anti-slavery constitution was drafted by the territorial legislature and approved by popular vote. Kansas finally entered the union as a state in 1861.

Until 1861–while Kansas was a territory — the governor was appointed by the President — not elected. That was the Federal law, the standard operating procedure for all territories at the time. So there would have been no gubernatorial candidate while the pro-slavery and anti-slavery forces battled, which seems to be the setting of the logline.