One day while conducting Telephone surveillance in South Block, New Delhi, Major Jai Bakshi (Sidharth Malhotra), an officer in the classified special operations unit DSD (Data Systems Diagnostics), overhears a representative of Indian Arms lobby Lt.Gen Gurinder Singh (Retd) (Kumud Mishra), an ex Army officer, attempting to bribe the Army chief Pratap Malik (Vikram Gokhale), on behalf of a Czech firm, with a USD $2.5 Mn offer. Pratap flatly refuses and rebuffs the offer. This angers Gurinder, who in turn threatens to expose the DSD's existence to the general public. This makes Jai suspect a major scam involving the Indian Army. After 2 months of continuous surveillance, he goes rogue along with his girlfriend Sonia, a cyber-expert (Rakul Preet Singh), and escapes to London. Capt. Maya (Pooja Chopra) informs Colonel Abhay Singh (Manoj Bajpayee), their team leader and Jai's mentor, about Jai's going rogue and his stealing of highly sensitive data from the DSD Office. Abhay activates his intelligence network and launches a manhunt for Jai, eventually learning about Jai's escape along with Sonia. He raids Jai's house but finds nothing. All this while, a corrupt Army Officer Brig. K Srinivas, spies on Abhay's movements and keeps reporting them to Gurinder. Abhay however outsmarts Srinivas and successfully manages to escape, and the DSD shift their office to an undisclosed location. Seeing his plan of capturing Abhay fail, Gurinder contacts an influential journalist and provides her with sensitive information, exposing Army's secrets.