The sudden implementation of demonetisation rattles the country, and a few black money hoarders in Kerala are trying their best to save their void currencies by hook or crook. Kasaragod-based financier Nithyananda Shenoy also gets embroiled in it, and drawn into the scene are also a few underprivileged folk in Kochi. Dramatic situations surrounding the hotchpotch ensue, as each one tries to set their lives straight.

Aadu 2 revolves around Shaji Pappan and his group of misfits, who take part in another tug-of-war contest to win the golden cup. But along the way they unwittingly get drawn into a deal gone wrong, which involves dangerous smugglers.

Inspired by Sherlock Holmes books, enforcement officer PL Thomas wants to crack a big case in his first posting. However, his wife's antics lead to the whole case going awry, even pushing him to the point to derangement. His scheme to salvage some pride as a last-ditch effort takes the plot forward.