“A young couple lost on a road trip through the desert mountains get entangled with a secretive doomsday cult, and must launch a daring escape before its charismatic leader can realize his plans to unleash Armageddon.”

I get the concept; a bit kidnapping with a side order of armegeddon. I think you can make it more effective if you replace some of the cliched expressions with something more colorful- “young couple”, for instance. If it’s a fundamentalist religious cult (not sure what religion), you might make the couple an “opposite”, perhaps atheists, or Hasidic Jews, or devout Mormons, something that entails additional conflict and irony.

Replace the word “entangled”; they’re not entangled, but perhaps ensnared? “Massive…attack” sounds like a heart attack, at least to me. There are better words than massive that give much the same meaning.

“Young Morman couple, lost while on a church mission, are held captive by a Fundamentalist Doomsday cult, plotting to enleash a terroristic event with global implications.”

You might not like mine as much, and I understand. Just wanted to provide an example. Good luck with your story!

“Ferociously driven” doesn’t sound right to me; I’d use “profusely driven”, or “abundantly driven”…if you’re going to mention the “critics” in the logline, best you give us an idea WHY she is critcized so much. My guess is that it is because she is so driven, but if not, I wouldn’t even include it.

“A profusely-driven FBI agent must help an amnesia victim recover his memory so he can help her catch a heinous crime boos, while also repairing her damaged reputation.”

Hope some of these ideas were of some help. Good luck, as it sounds like a great concept!