Black Money starts with Venu (Mohanlal,) who is one of the popular journalists in the city has a fear of politics there. Once, he is challenged by his fellow journalist Renu (Amala Paul) to investigate a corruption case. After preparing a perfect plan, both of them successfully gets some important footage about a political leader. But unexpectedly, Renu telecasts the footage, without informing Venu and it goes viral. The twist in the story starts when the corrupt minister tries to kill both the journalists. The crux of the story is how Venu and Renu manage to escape from the minister’s plan and how the minister get arrested.