From the very start of Abhinay Deo's Blackmail, it's clear that the fire of protagonist Dev Khosal’s (Irrfan Khan) marriage is down to its dying embers.
Deo expertly sets a grim stage that prepares us for the machinations to follow. We see Dev purposely staying late at work to avoid his wife Reena (Kirti Kulhari). He goes home to the measly, cold meal she sets out on the dining table for him; she can't be bothered to stay awake till he gets home. Still, it's obvious he adores Reena, but her interest in him seems limited to when she needs the television cable bill paid.
The story begins to spiral out of control – exactly as it’s meant to – when Dev discovers that Reena is having an affair. He secretly begins to blackmail Reena’s lover Ranjit (Arunoday Singh) for money, threatening to tell his wife about the affair. What follows is a series of unfortunate events.
After being blackmailed by Dev, Ranjit anonymously blackmails Reena. Dev’s colleagues get wind of his antics and blackmail him, threatening to tell his wife and, later, the police about what he's been up to. Ranjit hires a private detective who begins to blackmail Dev, offering to keep his identity from Ranjit in exchange for money. There’s an untimely death, the police get involved, friends turn against friends and lovers lose trust in each other.
It’s a narrative that spins itself like a web and leaves the audience asking, almost frustratingly, where this is all going. But the convolution effectively conveys the point that Blackmail is ultimately trying to make – wrongdoing begets wrongdoing, often with disastrous, unforeseeable consequences.