In the heart of Madurai, amidst the chaos of bustling markets and sacred temples, a street vendor's ordinary life takes a chilling turn when he discovers a cryptic note hidden in an antique brass lamp. Days later, his lifeless body is found in an alley, leaving the city's police baffled.

Enter Inspector Meera Iyer, a sharp and determined investigator new to Madurai's intricate lanes and darker alleys. As she follows the fragmented clues, she stumbles upon a clandestine smuggling network dealing in Sangam-era artifacts, threatening to upend centuries-old heritage.

With the clock ticking, Meera must unravel a conspiracy that ties the murder to an elite, shadowy circle of treasure hunters. But as the web tightens, she begins to realize that someone in her own circle might be involved—and no one can be trusted.

Set against the vibrant, historic backdrop of Tamil Nadu, "The Secret of Sangam Street" is a suspense-filled mystery of murder, betrayal, and ancient secrets waiting to be unearthed.