Almost invariably, we root for the con artist.

Seldom does the ingenuity and cleverness of a good hustler, card sharp or con man not win us over. They are, of course, walking metaphors for the movies. Through finesse and daring, they pull the wool over our eyes while emptying our pockets.

They’re also great roles for actors, our best liars, to showcase their powers of sleight-of-hand seduction and subtle transformation. “Sharper,” a fitfully delicious pile of deceptions and double-crosses, is made with evident appreciation for the genre. It opens with a definition of its title — “one who lives by their wits” — and “Sharper,” too, skates by nimbly enough by coasting on its cast’s smarts.

The film is a slinky, slick caper that finds ways to distort expectations while unfolding a puzzle-box narrative. Before its lesser third act, “Sharper” — propelled especially by the performances of newcomer Briana Middleton and the more veteran Sebastian Stan — manages to juggle its plot twists with panache.

It opens with a seemingly sweet note of romance. Sandra (Middleton) breezes into a used bookshop on the Lower East Side to pick up a copy of Zora Neale Hurston’s “Their Eyes Were Watching God.” She tells the guy behind the counter — Tom (Justice Smith) — that she’s getting her Ph.D. in Black feminist studies. The scene could be a meet-cute for a bookish rom-com. But we’re on guard for the scam. She’s forgotten money — is that the play? A free book? They go on a date and later return to the store to hold in their hands a first edition of “Jane Eyre.” Maybe that’s the goal? A fiendish scheme to swipe rare Charlotte Brontes? But as a character says later in “Sharper,” if you’re going to steal, steal big.

“Sharper,” structured as a series of vignettes each titled after a particular character, unspools as a series of ever-expanding cons. First, there is Sandra, in need of $350,000 to rescue her drug addict brother from his debtors. The second chapter rewinds to Sandra’s past, and her chance encounter with a skilled grifter, Max (Stan). He takes Sandra under his wing to school on the art of deception.

The grifters of Brian Gatewood and Alessandro Tanaka’s layered screenplay — unlike, say, Paul Newman of “The Sting” or Leonardo DiCaprio of “Catch Me if You Can” — are a more sober variety of fabulist, less a stand-in for the make-believe of movies than a concept to question and interrogate.

As “Sharper,” smoothly helmed by British TV director Benjamin Caron, continues to widen, it brings in more characters and back stories, including a New York socialite (Julianne Moore, also a producer) who’s dating a billionaire widower (John Lithgow). But the progression begins to work against the film. As “Sharper” turns increasingly melodramatic, we’re well-conditioned by then to look for the con, and see it coming a long ways out. The streetwise characters also wouldn’t be so easily duped by the late plot maneuvers. After a promising start, “Sharper” grows dull.

But there’s plenty to savor. Middleton brings such a shape-shifting radiance to the film that when she’s not present, the movie sags. And Stan has never been so arresting on screen. His cool nonchalance gives “Sharper” a bracing edge. The scenes that pair Middleton and Stan together are its most potent.

MPA rating: R (for language throughout and some sexual references)

Running time: 1:56

How to watch: In theaters, streaming Feb. 17 on Apple TV+