Samar (Shah Rukh Khan) meets Meera (Katrina Kaif) in London & they fall in love. Samar however meets with a serious accident & Meera vows to God to leave Samar, if He allowed him to live. Samar angered with God, becomes a bomb disposal chief in the Indian Army. Here he meets Akira (Anushka Sharma). Is Akira able to unravel the mysteries, does Samar win the battle, or does God surrender to his love?