The chance to bring to light a stealth Claimant to the Camelot Mantle is the media equivalent of the Holy Grail. Here is a tale of a woman raised in obscurity , in ignorance of her true origins. Living for years in the distant Provinces who has suddenly discovered her roots. More interesting, the Secret had been kept from her for over 50 years. Where the dark heart of conspiracy takes on a whole new meaning. This is the Zodiac speaking.

Okay I'm doing a lot of guessing here:

A woman discovers she's the spawn of the infamous Zodiac Killerand must fight against the dark forces after her and her small child.

I really have no idea what she's fighting against so just said ?dark forces? as a placeholder since this is a horror.

LIke Richiev I have no idea what the story is about.? And I am familiar with the case of the Bay Area Zodiac killer.

Of course, a logline? shouldn't describe the plot in detail and should never give away a Big Reveal or the ending. But it must succinctly answer 3 basic question as explained in? "Our Formula":
1]What is the inciting incident that sets the plot in motion?
2] Who is the protagonist and? what is her role?
3} What is the protagonist's specific objective goal? What is she struggling to achieve or acquire?

LIke Richiev I have no idea what the story is about.? And I am familiar with the case of the Bay Area Zodiac killer.

Of course, a logline? shouldn't describe the plot in detail and should never give away a Big Reveal or the ending. But it must succinctly answer 3 basic question as explained in? "Our Formula":
1]What is the inciting incident that sets the plot in motion?
2] Who is the protagonist and? what is her role?
3} What is the protagonist's specific objective goal? What is she struggling to achieve or acquire?