If “A Quiet Place” — the screenplay that put writers Scott Beck and Bryan Woods on the map — was a rather tight-lipped, high-concept monster movie where the characters could rarely speak, “Heretic,” their latest film, which they wrote and directed, is the opposite. This is a talky chamber piece of philosophical face-offs, debate duels and wordy warfare, though the outcomes remain just as harrowing.

But the danger of “Heretic” is not anything extraterrestrial — an alien from another planet — but rather the most common, and mundane, of earthly predators: a man.

And what a man Beck and Woods have cast in their religious horror flick, effectively weaponizing the befuddled British charm of one Hugh Grant, who has fumbled and grinned through such rom-com classics as “Notting Hill,” “Bridget Jones’s Diary” and many, many more. The genius of his performance in “Heretic” is that his manner is no different in this horror film than those romantic comedies, it’s just the nature of the conversation — and what he’d like to do with women — that’s different.

The story starts with two young Mormon women on a mission to baptize converts. Sister Barnes (Sophie Thatcher), savvy, street smart and clad in black, is visually opposed to the bubbly, outgoing Sister Paxton (Chloe East) in her demure pink cardigan. The pair arrive on the remote Colorado doorstep of a Mr. Reed (Grant) on a rainy afternoon because he’s expressed interest in the Church of Jesus Christ of Latter-day Saints, and despite doing everything right, keeping their wits about them, they still end up in peril.

They enter this curious and claustrophobic home only when Reed promises his wife is baking a pie in the other room, but he draws them into his labyrinth using false promises and rhetorical exercises. At first, the girls are only in danger of being forced to listen to one man’s extremely pretentious opinions about religion, philosophy, culture, and yes, pop music, which is terrifying in itself. But because this is a horror movie, there are, of course, more immediately existential threats lurking behind doors one and two.

As his questioning crosses taboos and boundaries, raising Sister Barnes’ hackles, cinematographer Chung-hoon Chung’s camera floats around the room like an invisible spider, circling and circling, weaving this trio into a diabolical web.

What’s scary is not what Reed has in store for them, but how these young women already know how to placate and navigate a Bad Man, how to “politely wrap this up.” He’s nothing new, just more noxious. Despite his belief that what he’s imparting is radical or even insightful, his claims are banal, his methods rudimentary, even the revelations about his intentions all too predictable. Beck and Woods don’t have to dream up something alien when these kinds of garden-variety predators are all too insidious.

“Heretic” excels on the strength of its performances: Grant’s charm offensive, Thatcher’s wary knowingness, and East’s ability to couch Sister Paxton’s surprising strengths under her girlish mannerisms. For Reed to meet his match in these people-pleasing Mormon girls, victims he sought out to manipulate, coerce and dominate — well, there is a gratification in that.

But because it is a genre flick too, there are overwrought visual metaphors, implausible twists and an unfortunate reliance on coincidence. The mechanics of the plot itself don’t quite hold up under scrutiny, which is a shame when the dialogue, performances and filmmaking craft are so tightly woven, moving in perfect sync.

“Heretic,” as a lecture on faith and ethics gone awry, is a story of belief versus disbelief. If there’s anything we take away from this tale, it’s not that faith is bad, or good, but that it exists in the eye of the beholder./Tribune News Service

(“Heretic” contains some bloody violence)

“HERETIC”

Rated R. At the Landmark Kendall Square Cinema, AMC Boston Common, South Bay Center, Causeway, Alamo Drafthouse Seaport and suburban theaters

Grade: B+

Hugh Grant stars in “Heretic.” (A24/TNS)