A young Sandeep Unnikrishnan (Adivi Sesh) grows up with his sister, Sandhya (Greeshma Prudhivi), and his parents, K. Unnikrishnan (Prakash Raj) and Dhanalakshmi Unnikrishnan (Revathi) in Yelahanka, Bangalore. As a child, he was very curious about the world around him. When his father took him to see a Navy ceremony with military airplanes flying in the sky Sandeep developed an early fascination with the life of a soldier. In his later years as a secondary school student, Sandeep falls in love with his classmate, Isha Agarwal (Saiee Manjrekar) (she is the new girl in school from Delhi). Sandeep and Isha start dating and get close to each other. Sandeep learns that Isha's parents are rich but have no time for her.Sandeep applied to join the Indian Navy without telling his parents, much to the fury of K. Unnikrishnan. However, the Navy ultimately rejected Sandeep's application, causing Sandeep to ultimately join the Army. Sandeep writes to Isha during his training, but never gets a response. He later finds that NDA Batchmate Harsh (Abhinav Singh Raghav), who was his rival was stealing Sandeep's letters to Isha and Isha's letters to Sandeep, to keep Sandeep distracted. NDA Batchmate Veer (Veeru Madimetla) alerts Sandeep who recovers his letters from Harsh and finds that Isha is leaving for Switzerland to pursue a course in Architecture. Sandeep travels all the way to Bangalore to meet Isha and to convince her to stay. They both profess their love for each other. As the years progressed Sandeep rose up the ranks to become an NSG training officer.In 2008, Sandeep is well established in his career as a training officer for the 51 Special Action Group of the NSG and is married to Isha, but their marriage is in trouble as she has sent divorce papers to Sandeep to sign. She lives in Bangalore and his unit is in Haryana. Over a period of time, they both got engrossed with their careers and Isha missed not being with Sandeep. Isha got preggers, but could not get in touch with Sandeep for 3 days (his unit was ambushed in a remote location of the country). She then has a miscarriage. She doesn't even tell Sandeep when he finally calls her back. When Sandeep visits, Isha asks him to stay, but Sandeep decides to serve his country. Sandeep asks for leave to try and save his marriage. On the same day as Sandeep's leave though, Pakistani terrorists (Terrorist Kasab (K Vineet Chandra), & Ali (Rocky Gondle), guided by Zaki/Handler (Varun Gyanchandani)) arrive in Mumbai by boat and they proceed to orchestrate deadly attacks in the city. Desperately crowds start heading to the Taj Hotel for safety but the terrorists also enter the hotel and start shooting at staff and guests indiscriminately.The local police are called to the scene but they are ill-equipped to deal with the threat. Upon discovering the terrorist attacks in Mumbai, Sandeep requests Commander Shera (Murali Sharma) to allow him to participate in the NSG mission to neutralize the terrorist threat. They leave for Mumbai and commence the military counter-terrorism operation: Operation Black Tornado, but the NSG encounters a vast number of obstacles and problems upon arriving at the scene.They lack surveillance cameras or the hotel blueprints to discover the number of people inside the building. The terrorists have installed deadly booby traps and trip wires with bombs throughout the premises. Several hotel staff and guests end up crowded together in a locked room, all bound and gagged on the floor. Sandeep decides to position snipers all around the hotel to cover the NSG team as they move through the hotel to flush out the terrorists. Sandeep comes face to face with Ali, and after a brutal hand to hand combat. Ali manages to escape by hiding behind a hostage. To make matters worse there is an intrusive media circus swarming outside the hotel reporting the NSG's known operations and movements, information which ultimately proves useful to the terrorists. Sandeep engages with the media and appeals to them that there are people trapped near the swimming pool, waiting to be rescued. The media ignores Sandeep and broadcasts this information. Sandeep was counting on this, as his info was fake and he was hoping to lure to attackers to the swimming pool to ambush them.In the meantime, there is a guest, Pramoda Reddy (Sobhita Dhulipala), who is trapped on the fifth floor. She manages to keep herself hidden from the gunmen and ultimately takes responsibility to rescue a dead British tourist's young daughter. Sandeep talks to Isha over the phone. She is applying for divorce and scolds Sandeep for not being there with her when she had a miscarriage, but she is horrified when she discovers that Sandeep is at the Taj Hotel.As the NSG rescue more hostages (several of whom remain tied up inside a locked banquet hall) and starts closing in on the remaining terrorists, Pramoda calls the downstairs lobby using a walkies-talkie from one of the dead security guards. Sandeep ultimately decides to go alone (as night operations are prohibited by the high command) to the 5th floor to save them, saying that he would never be able to forgive himself if he did not save her. His colleagues subsequently use tear gas and Sandeep races up to the 5th floor. He ultimately rescues Pramoda and the young girl and kills some of the terrorists. But he dies during the conflict.Sandeep's parents watch in horror as the news coverage shows that Sandeep was killed in action. They had mistakenly thought that since Sandeep was a training officer he was not involved in the rescue mission at the Taj Hotel. After his death, there is a large military funeral and a crowd of well-wishers gathers to mourn Sandeep's passing. Isha is devastated at Sandeep's death and discovers that he never signed the divorce papers. A 10-year commemoration ceremony in 2018 honoring the lives taken during the attack at the Taj Hotel. K. Unnikrishnan gives an impassioned speech in which he says that Sandeep should be remembered not for how he died, but for how he lived. During the commemorations, Pramoda is reunited with the young girl whose life she had saved.