-he sexual tension is mentioned nowhere in the rest of the query. In fact, it doesn't feel like the characters interact much at all.
PREDATOR IN THE PINE BARRENS is paranormal thriller containing an increasing sexual tension between the two main characters.
-Also, by leading with this, it makes it sound like the story is all about sexual tension.
-Animal? Man? Rutabaga? Be specific.
In the rural regions of southern New Jersey, known as the Pine Barrens, bizarre killings begin to mount.
-This sentence is passive voice. You want to avoid that if all possible, especially in a query letter.
-I find it unusual that you start with the setting, instead of the main character. I think you want to focus on the character-drive story.
-Why do they give him little pause? If they're freakish, they should give him great pause.
At first the freakish animal mutilations on a local farm give detective Hunter Matthews little pause but when a late night roadside murder mirrors the same method of killing he begins to suspect a psychopath is on the loose.
-I would say M.O. instead of "method of killing" - word conservation
-Wouldn't a mutilated body do more than make someone just "suspect" a psychopath?
-And that alternative theory is...?
Paranormal Investigator Casey Windall, looking for a real story to break, inadvertently becomes involved in the investigation when she hits something as she tries to make her way to the crime scene of the roadside murder. As suspects are eliminated Casey proposes an alternative theory that Hunter initially dismisses but can’t entirely shake from his conscious.
-What is that something she hits?
-More word conservation - "tries to make her way" could be "drives", "but can’t entirely shake from his conscious" could be "but can't ignore".
-"a mythical beast from folklore" is repetitive
Casey begins to look further into the possible reality that a mythical beast from folklore known as the Jersey Devil may actually be more than a scary campfire story.
-I don't see this line as being especially necessary. Nothing happens in this sentence. Just more murders. No new character development or plot development.
More killings occur that Hunter looks into and when a mass murder of sixteen people confounds another police department, he is called in as a special investigator.
-Doesn't this count as part of the "looking further" she was doing before.
Meanwhile Casey tracks down a credible lead that reveals knowledge about the beast that’s been hidden in plain sight.
-"that's been hidden" is passive voice.
-You never say what that clue is, so I can't get invested. In fact, your characters don't seem to have any personality. What are their character archetypes.
-This sentence means nothing. How does their reality unravel? A history neither wants nor accepts tells me nothing about what happens in the story.
As they both begin to witness their perceptions of reality unravel, what comes to pass is an answer rooted in history that neither wants nor can accept.
-This query could be cut by half. I the first half is the basic set-up -- bizarre killings that could be the work of something supernatural. The rest is rewordings of the phrase "they investigate further".
-I think you need to reexamine the real summary based on who the main character is/are, what they want (both internally and externally, which is to stop the murders), and what's stopping them from doing it. In this case, I assume it would be a lack of clues. But if that's the case, tell us what clues there are so we can be intrigued to read more.