Presumed dead, a vengeful old man uses his grandson as a vessel to help the police bust the cult that has destroyed his own life in order to save the human race.

As the others have said.

I think the logline should focus on, be framed in terms of the character who is most in jeopardy, who has to take the greater risks.? In which case, it? seems the grandson should be cast as the protagonist, not the grandfather.

Also, for the old man to want revenge -- okay,? that's understandable.? But to? say that the fate of the human race is at stake seems over the top in terms of the stakes. Exactly how does the?cult pose a threat to the survival of all humanity?? What makes the cult so horrible?

And why would the grandson consent to be used as pawn by the grandfather?? What's his motivation for putting his life in jeopardy?

As the others have said.

I think the logline should focus on, be framed in terms of the character who is most in jeopardy, who has to take the greater risks.? In which case, it? seems the grandson should be cast as the protagonist, not the grandfather.

Also, for the old man to want revenge -- okay,? that's understandable.? But to? say that the fate of the human race is at stake seems over the top in terms of the stakes. Exactly how does the?cult pose a threat to the survival of all humanity?? What makes the cult so horrible?

And why would the grandson consent to be used as pawn by the grandfather?? What's his motivation for putting his life in jeopardy?

Some great comments by Richiev and giannisggeorgiou.

Why not make the Grandson the protagonist and he's avenging his grandfather's death? The best thing about doing it this way is the audience is then following a protagonist who knows as little as they do. This would likely reduce the amount of exposition required in the first act as the information would be discovered along the way. The grandfather could have left clues for the grandson making it a really creepy detective-type film.

The protagonist needs to be the one who busts this cult. No police. In fact, if anything, the police are involved with the cult. Make this as tough as possible for the protagonist, he has nowhere to turn - except to the B-story - best friend, love interest, his grandfather's 86 year old girlfriend? Horror works best when someone is isolated in as many ways as possible. I also think he shouldn't just be busting them... he should be destroying them. Similar to the end of 'Get Out' (no spoilers but watch the movie and you'll understand).

The biggest problem currently is the ambiguity mentioned by Richiev. I don't really want to add my comments regarding that until there's been clarification.

Hope this helps.