Set in a sleepy South Indian hill station, *Killer Soup* follows Swathi Shetty, an untalented home cook who dreams of opening her own restaurant, and her bumbling lover, Umesh, a mediocre masseur. Trapped in a
loveless marriage with Prabhakar, a suspicious and controlling man, Swathi hatches a desperate, hare-brained scheme to be with Umesh. When Prabhakar discovers their affair, a confrontation turns fatal, and Swathi accidentally kills her husband. Driven by self-preservation and a warped sense of ambition, Umesh convinces Swathi that they can execute a daring identity swap. Since Umesh is an aspiring actor with a facial scar, they decide to kill him—or make it look like he is dead—and have him undergo plastic surgery to return as Prabhakar, allowing the couple to inherit Prabhakar’s lucrative
family business and wealth.However, their amateurish plan immediately spirals into a chaotic web of dark comedy, suspense, and escalating errors. Before Umesh can assume Prabhakar’s identity, Prabhakar’s observant and suspicious twin brother, Arvind, arrives in town, instantly sensing that something is terribly amiss. Arvind begins investigating his brother's sudden disappearance, uncovering a trail of inconsistencies that unnerves Swathi and Umesh. Concurrently, a pair of bumbling local police officers stumble into the case, driven more by personal incompetence and eccentricities than actual investigative skill, yet they occasionally pose a genuine threat to the conspirators.As the pressure mounts, Swathi and Umesh find themselves forced to commit increasingly absurd and violent acts to cover their tracks, transforming from timid lovers into hardened, albeit deeply flawed, criminals. The psychological toll fractures their relationship, breeding paranoia, distrust, and desperation. The climax delivers a chaotic convergence of mistaken identities, black-market surgeries, and impending police exposure. In the end, the line between victim and perpetrator blurs completely as Swathi embraces a chilling, newfound confidence, proving that her culinary ambitions—and her survival—are far more dangerous than anyone ever imagined.