'Goa meri jaan, jannat ki shaan. Par jannat mein bhi saanp baste hain, aur saale kya dass te hain,' utters ACP Vishnu Kamath (Abhishek Bachchan) in the very first scene of Rohan Sippy's DUM MAARO DUM. It's an apt introductory line for the rollercoaster ride that follows.

Vishnu has been given the responsibility to 'clean' Goa which is 'high' on drugs because of the drug mafia, led by Lorsa Biscuta (Aditya Pancholi). Five years back, Vishnu used to be a corrupt cop. He was a 'Gandhi bhakt'. The Gandhi who was 'printed on notes'. But a terrible incident completely transformed him. And now he's all set to fight the bad guys.

Lorsa Biscuta had lured Zoe (Bipasha Basu), who used to be the girlfriend of Joki (Rana Daggubati) into his drug business. And now he's all set to ensnare Lorry (Prateik Babbar). It's further learnt that Biscuta is helped by a certain Michael Barbosa. What follows is a tumultuous journey which unravels as it proceeds.