
Swathi Shetty, a talentless home chef, cooks up a bizarre plan to replace her husband, Prabhakar, with her lover, Umesh; when a bumbling inspector and amateur villains stir the pot, things don't go as planned and a recipe for chaos ensues.
Killer Soup opens in the fictional town of Mainjur, where its gaze swiftly introduces the main house. It looks calm and normal from outside- we see the photographs of the husband and wife, and both of them get ready for the day- Prabhu choosing what to wear from his collection of bright printed shirts while Swathi prepares her paya soup. By the end of the day, however, the circumstances will change for the worse- when Prabhu will learn that Swathi is having an affair with his look-alike (but with a squint eye) masseuse Umesh. Meanwhile, it takes time for Prabhu's lies- the failed hotel deal with his corrupt brother Aravind Shetty (Sayaji Shinde), his affair, and a doomed side detective at work.

The makeover, as desperate as it looks, occurs in breakneck speed in Killer Soup- once the lies start to pile up one after the other. The ingredients are too much to bear at times- how Swathi manipulates Umesh into a dangerous makeover, the involvement of the police (Nassar) and his eager subordinate ASI Thupalli (Anbuthasan), and many more characters that get sucked into this web of lies and deceit.