Gaurav (Siddharth Malhotra) is an aspiring sales executive of a multi-national corporation, living in Miami, United States. Despite being clay-model of an idealistic boyfriend, his longtime crush and would be girlfriend Kavya (Jacqueline Fernandez) is not taking him seriously. She was never into those guys who are too uptight and proper or have serious traits of OCD going on! As story progresses and Gaurav was asked to visit Mumbai for a given task, he met with an accident, which notified Colonel Vijay Saxena (Suniel Shetty} and his right hand Yaqub (Darshan Kumaar) that a former member of government' secret intelligence division 'Unit X' and their former agent Rishi (Siddharth Malhotra) look identical to each other. Apparently, Rishi stole some secret information which can put Unit X's reputation and credibility in danger! So, in order to retrieve that stolen information Colonel Vijay send a team of top-notch assassinator to hunt down Rishi or Gaurav as narration goes.