What evil lurks beneath a habit in ‘The Nun’?

While a new generation of filmmakers has breathed new life into horror by embedding it with frightful and salient social commentary, the “The Conjuring” franchise — of which “The Nun” is a spinoff and the fifth installment — isn’t about anything so real.

It’s about exhuming classic horror archetypes — creaky old houses and creepy old dolls — with (mostly) old-school effects. And what’s more old school than a mean ol’ nun?

Set in 1952, “The Nun” is the origin story of Valak (Bonnie Aarons), a demonic nun who first turned up in “Conjuring 2,” as the pursuit of Vera Farmiga’s paranormal expert. This time, our protagonist is Sister Irene (played by Vera’s younger sister Taissa Farmiga), a novitiate who, just before her vows, is dispatched by the Vatican, along with Father Burke (Demian Bichir), an expert in unexplained phenomena (or as he says, “miracle hunting”), to a remote Romanian abbey where a young nun has just hanged herself.

The decaying, overgrown abbey and its adjoining covenant are suitably eerie. The place, handsomely crafted by production designer Jennifer Spence, has the feel of a horror-movie set, complete with a foggy cemetery, and the action that follows has the almost comforting pattern of surprises and scares that’s to be expected. Entering the gothic world of “The Nun,” built so sturdily on horror movie clichés, is to slide into a darkly fantastical realm that’s practically cozy it’s so familiar.

Crypts turn into traps, apparitions flicker in the mirrors and ancient Christian dogma will be used for all its sinister power. Certainly, anyone who goes anywhere at any time clutching a lantern will run into trouble.

But what distinguishes “The Nun” is its silky, sumptuous shadows. Directed by British filmmaker Corin Hardy (“The Hallows”) and shot by Maxime Alexander, “The Nun” shrouds itself so much in darkness that it at times verges on becoming a nightmarish abstraction. You almost lose sense of what exactly is going on, as Sister Irene falls into a labyrinthine abyss.

The spell, of course, gets broken as the demands of plot and franchise return. And “The Nun” has little to offer beyond: Beware of spooky Romanian abbeys. But for a moment or two, it hangs suspended in a luxurious gloom, the kind that these days passes for a welcome escape.

AP PHOTO/JUSTIN LUBIN Ingrid Bisu in a scene from “The Nun.”