At a truck stop in Arkansas, a retired alcoholic cop turned paranormal investigator on a quest to reunite with his deceased son warns a brother and sister not to check into the Hardin Hill Bed and Breakfast.

Update.

A retired alcoholic cop turned paranormal investigator, meets a brother and sister Alex and Laura Norvin at an Arkansas truck stop, and after narrowly escaping an active shooter event the three travel to a haunted bed and breakfast where the three question their perception of reality.

Most definitely, Moses is a main character who sets the visual scene for what is to come and until the breakout to the second act his is the protagonist. His son is his motivation and it drives the story until his death.

At his death Laura will assemble the final bits of information Moses has left then which begins to unravel a story which questions Laura's reality as she assumes the protagonist role and faces off with the antagonist which is another misdirect for until we learn the perceived antagonist was not the true antagonist.

I do believe you are correct the misdirects make the logline difficult to write.

I think as a starting point for the logline, I am not sure if the cop is the lead character or the young couple.

You say you are going to start off with a death, I assume the cop's son.

But then the police officer warns the young couple about staying in the hotel. Usually, the warning comes to the lead character/s. Since they are the ones being warned it seems like they might be the lead characters.

So definitely a little confusing and obviously because you also seem to want to start the story off with a misdirect, that will make the logline a little bit tricky to write as well.