Loglines are not an artform, they're a squid game. Anyway,

1880s London: an assassin determined to complete her assignment to kill a spiritualist is interrupted by repeated flashbacks of childhood trauma and resorts to attacking a public figure to expose the target and finish her mission.

Quoted from ajr This is a tough one. I think I'm close, but I have questions. Like Dave alluded to - if she's an assassin sent to prevent a war, where does this seance come in? Seems out of left field. It tells me there might be a logic concern early in the script. And the war itself - you say "to prevent a looming war". I looked it up and in the 1880s the British fought the first Boer War, which obviously did happen. Is she involved in this? Or did she prevent the war? If so, between which two sides? And loglines should really be one sentence. They can be compound sentences, but the longer they are, the more the reader loses the plot along the way. Here is my attempt, making some assumptions: An American assassin, embroiled in the First Boer War, confronts her dead father at a seance and seeks revenge on the spiritualist. Hope this helps. AJR

That's a good logline AJ. Maybe a few more ornaments on it - but it is crisp and clean.

I have to disagree with you Dave, Ajr's logline doesn't explain the relationship between the assassin and the spiritualist. Something my earlier loglines were criticized for.

I'll add one more piece of advice that might help, or not. Up to you.

If I were to read the back cover of your DVD to decide if I was going to watch your movie it would leave me primarily confused, and apart from the steampunk Thriller angle I'd probably put it back. An assassin, a spiritualist, a public figure, abuse, vengeance. Good components separately but I'm not feeling drawn to much on an emotional level or how all these things connect.

Choice of words is important. Too bland, you lose me.
Take Spiritualist, for example:
Psychic, Medium, clairvoyant, paranormal investigators, are way more emotive descriptions.

A good Logline appeals on a visceral level, it connects with its target audience, it promises to take me on a ride.

If you're going more for surreal, absurdist, weird (think Lynch, for example) all good, but you need to hook me with story, stakes, ticking clock etc. GSU.
http://scriptshadow.blogspot.com/2011/08/article-gsu.html

You know the ins and outs of your story which is obviously why you're rejecting a lot of the suggestions put forward here, as they don't tally with the specifics you've written. I'm guessing it is written?

At this point you're probably frustrated re feedback, but imho some Loglines can't exist in a vacuum and without a script.

I suggest you post the script (or at least the first ten pages in WIP).
https://www.simplyscripts.net/cgi-bin/Blah/Blah.pl?b-workinprogress/

Get feedback that way on your story and logline.

I totally get what you're talking about LC, but I'll save that for once the thing itself works to my satisfaction. In this instance I'd want to replace spiritualist with cultist or cult leader.

And yes, it is written. I'm in the middle of a clean-up pass on the 2nd draft.

Quoted from Hallucigenia Loglines are not an artform, they're a squid game. Anyway, 1880s London: an assassin determined to complete her assignment to kill a spiritualist is interrupted by repeated flashbacks of childhood trauma and resorts to attacking a public figure to expose the target and finish her mission.

Okay.  Now I'm totally lost. I'm out. The mission was to stop a war. Sincere best wishes.

Quoted from Hallucigenia Loglines are not an artform, they're a squid game. Anyway, 1880s London: an assassin determined to complete her assignment to kill a spiritualist is interrupted by repeated flashbacks of childhood trauma and resorts to attacking a public figure to expose the target and finish her mission.

Okay.  Now I'm totally lost. I'm out. The mission was to stop a war. Sincere best wishes.

And how does an assassin stop a war? By saving people?

Quoted from Hallucigenia And how does an assassin stop a war? By saving people?

If they assassinated the person who assassinated the Archduke Ferdinand.

Quoted from Hallucigenia And how does an assassin stop a war? By saving people?

I haven't a clue. But that us what your logline said her mission was.

I've posted the first 14 pages here: https://www.simplyscripts.net/cgi-bin/Blah/Blah.pl?m-1670239212/

An assassin embroiled in a plot against Queen Victoria is psychically attacked by a mysterious cult, flooding her mind with memories from a madman and inflaming her to pursue the cult’s destruction.

Aside from potential specific word changes, I think this is it. Thanks to every one that offered their opinions. Now I am diving into the 3rd draft to make the ending as near perfect as I can get it.