This is what I have been sending out.

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Dear [Agent],

Justin Adams doesn’t want to be a murderer. His life is great. He’s got a best friend that always has his back, and a girlfriend guys would kill for.

And he loves his girlfriend, Jessica. Maybe loves her too much. In fact, his freakish psychosis for her creates several conflicting thoughts and emotions in his mind.

When voices tell Justin his “perfect girlfriend” is being unfaithful, he struggles to ignore them. Jessica would never be unfaithful. But the newest man-whore hanging around her might. The voices get louder, more persistent. And soon, those voices are all Justin thinks about.

It’s not long before Justin realizes what’s happening to him. He’s being possessed by a demon, grown out of his own psychosis, jealousy and lust. He knows if he doesn’t fight back, Jessica and her friends are in for one hell-raising night. There’s just one problem: fighting the demon might mean lights out for Justin Adams.

Jealousy Kills is my horror novel completed at 82,000 words. Thank you for your time and consideration. I look forward to hearing from you.

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I also have a question, too: I've thought about actually starting the first line with: "Justin Adams loves Jessica, but he's becoming a demon" or "Justin Adams is becoming a demon" and then I thought about 'fixing' it further down in the query letter, where I already mentioned the demon aspect (that would then probably change the entire query, but I'll try anything to make it even better). Do you think one of those I just stated work better than "Justin Adams doesn't want to be a murderer?" I'm having trouble deciding what would be best and more hooking.

Oh, and would you say I should probably change the title, too. Does it sound a little, I don't know, too simple, or like it's trying to teach a lesson? Or is it all right?