Police Commissioner Eashwar Prasad (Daggubati Venkatesh) standing at the lakeshore, describes in a voice-over about his termination due to a common man walked into his life and turning everything topsy-turvy. This scene leads into the flashback. An unnamed man (Kamal Haasan) is shown strategically placing a travel bag within a train in a railway station, bus and in a multiplex at Hyderabad. He proceeds to place another bag, under the false pretense of lodging an FIR, in the toilet of a police station located at Lakdi-ka-pool, Hyderabad. He then arrives on the rooftop of a building under construction near Raj Bhavan road and sets up his base of operations, equipped with various modern technology gadgets and instruments. He calls up Eashwar and informs him that 5 bombs have been placed in different locations throughout Hyderabad, which are programmed to explode simultaneously within four hours. The common man demands that he would like to negotiate with a senior Government official. Eashwar seeks the services of the Chief Secretary(Lakshmi) to act as the negotiator. Eashwar also alerts his team involved in intelligence research and surveillance, tapping all the available resources in gathering preliminary information and tracing the location of the caller. Meanwhile, the caller tips off TV9 news reporter Shilpa Rajkumar (Anuja Iyer), telling her to reach Lakdi-ka-pool police station immediately as it is going to be “the most important day of her life”. Eashwar cleverly uses Shilpa to fake a report on live television that four terrorists are being relocated to an undisclosed common site, turning the caller’s tool back onto him. Eashwar’s men find out that the caller is using advanced software to switch the numbers and locations of his mobile phone SIM card every minute, rendering their manpower and the obsolete equipment useless and prompting them to employ the services of a young hacker, who turns out to be an IIT dropout. In the meantime, Eashwar is also able to obtain a facial composite of the caller with help of the police officer to whom the caller had approached to lodge the fake FIR during the earlier scenes of the film; but much of the time passes without any concrete results on the identity or the location of the caller. Ultimately, Eashwar agrees with the caller’s demand and puts two of his best men, Arif Khan (Ganesh Venkatraman) and Gautham Reddy (Dr. Bharath Reddy), in charge of handing over the four terrorists along with cell phones at the old Begumpet Airport (end of Runway no. 4). The caller also demands reporter Shilpa to reach the nearest police station at Begumpet. The caller calls up Eashwar, as he is on the way, for a final time to further reveal that he had not planted any other bomb in the city. At this point, Eashwar surprisingly declares he already knew there were no more bombs which make it clear that his decision to kill the last terrorist wasn’t taken in fear but in confidence. Eashwar reaches the caller’s location just as the latter is leaving the place, having destroyed all his gadgets and equipment, leaving behind no evidence. The two meet briefly when Eashwar, identifying the anonymous caller on the basis of the face sketch, offers the man a ride home and introduces himself. Both shake hands when Eeshwar’s voice-over cuts back as he says the man told him his real name, but his name doesn’t have any significance. The film ends on an idealistic note, with Eashwar admitting that they all knew the common man was disturbed because of the insecure environment and the incompetence of the governing authorities, but he never imagined him to go to such lengths and have the guts to do something like that. He also repeats that the facts of this incident cannot be found in any written record but only in the memories of those who actually witnessed it, and acknowledges that although the incidence has ambiguous moral significance, he personally feels that whatever happened, happened for the best.