As thrillers go, “Accused” is simplicity itself. It’s just a guy, hunted, identified, harassed, threatened and tracked-down online, trapped in his parents’ house, waiting to be doxed, swatted or worse.

The clever touches in the script to this new British thriller, now streaming on the free TV streamer Tubi, include having our victim Harri see the disaster that his life becomes unfold in near real time, in the most toxic chat rooms and comment boards of the Internet.

Writers Barnaby Boulton and James Cummings show our protagonist, a 20something middle class Brit (Chaniel Kular of Netflix’s “Sex Education”) of undefined Middle Eastern heritage stare, slack-jawed, as he first is told by his girlfriend (Lauryn Ajufo) that he “looks just like” this “person of interest” in the morning’s train station bombing. Next thing he knows, others are talking up “I think I know that guy” in chat threads. They’re egged on into naming their hunches.

Harri’s name gets out. Crowd-sourcing and facial recognition software outs his girlfriend, Chloe, his address, his parents and eventually his parents’ address.

“Nothing like a good foxhunt,” one of the anonymous accusers chortles, Internet brave because of that anonymity,” certain they have their quarry — as are many — because of his or her mad Google Search skillz.

Best of all, we know little of Harri’s work life or experience of the world. He’s got no “particular skills.” Calling the police isn’t wholly futile, but it’s close. And this is Britain. The house isn’t stuffed with guns or even all that secure.

He’s just a fearful young man, house-sitting the family dog as his parents take a vacation, waiting for the ever-escalating online rhetoric to inflame someone enough to come looking for him with intent to harm.

Actor turned director Philip Barantani (“Boiling Point”) parks us in this world, showing Harri’s reluctance to even go public with his “secret” girlfriend, but helpless to avoid popping up in strangers’ selfies as he boards a train in that very station the very morning of the attack.

“Privacy” is a myth.

The film limits its point of view to what Harri knows, and what we see and he can guess about his racist, quick-to-judge online accusers. As we’ve learned time and again in recent years, online crowd-sourcing can be quick to ID a mass shooter or a domestic terrorist attacking the U.S. capital. Sometimes the crowd even gets it right.

The plot plays out in seriously conventional thriller ways. It’s a wonder anybody bothers with foreshadowing any more, but good screenwriters still add it by force of habit.

“Accused” and its star do an excellent job of capturing Harri’s helplessness, his fear that the police won’t be bothered, or might instead come for him, that his parents’ neighbors might not be as tolerant as they seem, that no one will save him and he’s too panicked to save himself.

And the viewer is reminded that none of us are ever more than an anonymous slander away from a “piling on” by people quick to judge, eager to escalate and impossible to get to apologize.

Rating: TV-MA, violence, profanity

Cast: Chaniel Kular, Nila Aalia, Nitin Ganatra, Frances Tomelty and Lauryn Ajufo

Credits: Directed by Philip Barantani, scripted by Barnaby Boulton and James Cummings. A Tubi release.

Running time: 1:27