A Russian model finds her way into Gautam Subramanyam's (Jayam Ravi) hotel room and is found murdered beside him on bed. Gautam, a doctor visits Russia for two weeks for a conference and he is clueless as to who the woman is and why he is being implicated in the crime. He is taken to custody and escapes, helped by an Indian lawyer Lakshmi Rai. Amidst the ruthless, unforgiving judicial system the doctor finds out the damning truth behind the drug mafia. Rakshakudu is the dubbed version of Dhaam Dhoom completed by Manikandan when acclaimed cinematographer and director Jeeva died while making it. The film moves back and forth as the doctor in jail recollects how he met Soumya (Kangna Ranaut) and the developments that lead to their engagement. Two weeks before the wedding the doctor goes on a trip to Russia and is stuck there battling for help. Kangna doesn't quite fit into the village girl's role, she lacks the south Indian features and looks like a midget when paired with the tall hero, the dubbing too didn't gel.