The elite investigation unit of the Calcutta Police, headed by Joint Commissioner of Police Tanya Samanta, is busy handling a hooch-death case. But they are soon summoned to investigate a series of horrific crimes that have stunned the city. A brutally assaulted woman is found on the banks of the lake in Minto Park. A second woman wakes up at dawn in Survey Park after suffering from a lethal blow to the head, her memory hazy. A young female scholar, a visitor to the city, is raped, badly beaten and left for dead at the Dhakuria Lake premises. Tanya and her team are determined to hunt down the criminal. The chase spans international borders, but he manages to escape. After lying low for a few months, he returns to the city to attack a woman so violently, she almost dies. Tanya hatches a fool-proof plan to nail him.