The eeriest scene in the gripping techno-whodunit Searching consists of little more than a computer screensaver, glowing silently in the dark like a jellyfish. A series of incoming call notifications pop up on the screen, but the computer’s owner, David Kim (John Cho), is asleep and thus unaware that his teenage daughter, Margot (Michelle La), is desperately trying to reach him.

The moment takes on layers of Hitchcockian dread and a paralysing sense of helplessness: Thanks to bad luck and human error, not even the devices that connect us 24/7 can tell us everything we want to know.

The dubious paradoxes of internet technology — its power to inform and deceive, to connect and alienate — are at the heart of this ingeniously high-concept thriller from the 27-year-old writer-director Aneesh Chaganty. A Bay Area native and former Google employee making a sharp, confident feature debut, Chaganty employs a formal gimmick that clearly reflects what he knows, but also what any 21st century screen addict knows. Unfolding entirely on a series of computer and phone displays, Searching both captures and defamiliarises an experience that most of us would consider mundane, even banal.

This isn’t the first movie to turn FaceTime chats and browser windows into the stuff of a taut, intriguing, sometimes uncomfortably voyeuristic drama. Earlier versions of this conceit played out in the 2014 Elijah Wood shocker Open Windows and the recent Unfriended horror movies, all of which were about computer owners being terrorised by off-screen psychopaths. The novelty was that each of those thrillers played out in real time, so that you, as a viewer, felt unsettlingly hard-wired into the user experience.

Although Searching is no less accomplished in its formal syntax — at any moment you may find yourself marvelling at the low-key accuracy of the production design, or the ease with which a moving cursor can hold your attention — it doesn’t play out in real time. The mystery here, in which a father tries to find his missing daughter by digging into her online history, plays out in a less sadistic, more intimate register, and it benefits from having someone as recognisable and appealing as Cho in the driver’s seat. Because his story unfolds over the course of a week, Chaganty relies on familiar narrative techniques such as exposition and montage, and he and his ace technical collaborators maintain visual interest by continually reframing David’s screen with strategic cuts and zooms.

The prologue alone compresses more than a decade of family life into a laughter-and-tears montage, composed from photos and videos stored on the Kims’ desktop computer. We watch as David and his wife, Pamela (Sara Sohn), happily raise Margot (played by a few actresses of different ages), their lives a flurry of piano lessons and morning jogs. There are ups and downs, highs and lows, none lower than Pamela’s long, difficult battle with cancer.

The story proper picks up sometime after Pamela’s death. David has sadly moved on with Margot, who is by all appearances a smart, well-adjusted 16-year-old, at least from our brief glimpse of her in an early FaceTime chat with Dad. The actors have a lovely, unforced rapport that toggles gently between affection and exasperation: When David sends Margot a text message one afternoon, playfully chiding her for having forgotten to take out the trash, he makes sure to include a photo of the overflowing can. Margot promises she’ll take care of it when she gets home.

Except that she never makes it home (cue those frantic middle-of-the-night phone calls), and David soon finds himself plunged into every parent’s worst nightmare — albeit one that unspools more slowly and realistically, at first, than the average missing-persons melodrama. Filtering their story through Google searches, video chats and other online applications forces Chaganty and his co-writer, Sev Ohanian, to apply a step-by-step procedural rigour, ensuring that the audience doesn’t miss any crucial details. The movie is so insistent on plausibility that it takes several hours before David even realises that Margot might be in serious danger.

At the recommendation of Det. Rosemary Vick (Debra Messing), who’s leading the police investigation, David begins searching Margot’s laptop for clues to her disappearance, with some help from his more laid-back younger brother, Peter (Joseph Lee). Dad’s sleuthing generates some sly comedy, but he turns out to be as tech-savvy and resourceful as he needs to be as he pores over Margot’s email and social-media accounts, calls up her Facebook contacts and tries to piece together her last known whereabouts.

The heart of the investigation, and the movie, is a trove of old live-cast videos that Margot had recorded and saved. Watching them for the first time, David begins to appreciate how much he didn’t know (or care to ask) about his daughter, namely how profoundly lonely she had become following her mother’s death. In these moments, Searching poignantly explores both the comfort and the isolation that technology can breed, even as it considers the lasting effects of grief. It also satirises the ways in which that grief can be mocked and exploited, through mindless online gossip, sensationalist media coverage and the performative sympathy of onlookers.

Searching is nothing if not ambitious, and its rapidly accelerating second half is jammed with bold twists, red herrings and breathless confrontations. It’s also here that the movie begins to slacken its grip _ partly because some twists beggar belief, and partly because they strain the limits of the online-all-the-time interface. The sheer volume of plot that has to be recapped via TV news footage is both understandable and disappointing, forcing the picture to behave like a more conventional thriller and muddying the question of whose perspective we’re following.

The movie is at its strongest when that perspective is David’s, and Cho, following his superb lead turn in last year’s very different Columbus, gets the kind of full-bodied actor’s showcase that has eluded him too long. He runs the full gamut of fatherly emotions like a pro, escalating from mild panic to violent outrage, but the key to Cho’s charisma, a quality that Hollywood seldom knows what to do with anymore, is that he can just sit there and still hold your attention. He may just be a guy in a plaid shirt mumbling into a webcam, but that doesn’t make him any less of a movie star.


Don’t miss it!

Searching is out in the UAE on September 20.