The day's guests include British-Muslim heiress Zahra and her American husband David, with their infant son Cameron and his nanny Sally, as well as ex- Spetznaz operative Vasili. That night, 10 terrorists who were part of Pakistan based terror outfit Lashkar-e-taiba, directed by a man known as "the Bull", launch a coordinated assault against 12 locations across Mumbai , including the hotel. As the local police are not properly trained or equipped to handle the attack, they can only wait for special forces to arrive from New Delhi.
In the ensuing chaos, Arjun, David, Zahra and Vasili are trapped in the hotel restaurant with several other guests while Sally, unaware of what is going on, remains with Cameron in their hotel room. David sneaks past the terrorists and successfully reaches Sally and Cameron.
Arjun follows Oberoi's instructions and escorts the guests under his care to the Chambers Lounge, an exclusive club hidden within the hotel, where they hope to remain safe.
David, Sally and Cameron attempt to regroup with them, but David is captured by the terrorists at gunpoint while Sally and Cameron are trapped in a closet.
As a hostage David is tied up on the floor in a separate room. Meanwhile, police officer DC Vam and his partner decide to enter the hotel in the hopes of reaching the security room so they can track the terrorists' movements. Arjun attempts to escort a mortally wounded guest, Bree, off the premises so she can reach a hospital. The two encounter the police but Bree panics and flees, only to be shot dead by a terrorist.
