The movie opens with a woman (Vasudha) getting off from the bus at 15 km before the Bastar district, she tumbles and falls down after walking a few steps. An elderly man (Hari) is seeing psychiatrist about hallucinations of his wife, & he is then recruited by his son's wife who takes him to his wife's funeral, where he steals her ashes and leaves a diary for his son.

 

It is then jumps to past where, Vasudha (Vidya Balan) is a florist and a single mother whose husband is missing for five years, bound to traditions she has been waiting for him since he left her. Vasudha meets Aarav Ruparel ( Emraan Hashmi) in one of his hotels, where she works as a floral arranger. He creates a drama of miss happening of fire in order to watch capabilities of security department.Vasudha came in order to save him. He offers her a job in his hotel in Dubai which she refuses. Despite her refusal Aarav ask her to reconsider the offer. Vasudha gets to know from police that her husband Hari ( Rajkumar Rao) has murdered five American journalists and he is a member of a terrorist group. Police asked her to inform about Hari if he ever visits her. Worried for her son's future she accepts the offer given by Aarav.

 

Despite knowing about Vasudha's past and her son, Aarav falls in love with her. Aarav tells his mother story to Vasudha, who was a cabaret singer and single mother and how she falls in love with a man who try to commit suicide for failing to save them from poverty. Vasudha shuns her feelings saying that she belongs to someone else and leaves. Vasudha meets Aarav's mother on his request where she accepts Aarav's love and both unite. They both spend romantic moments together.Aarav gives a divorce paper to Vasudha before dropping her home. Vasudha then encounters Hari at home, and tells him about Aarav, he went out in anger where he is arrested by the police and latter jailed for being as a wanted criminal. Vasudha asks Aarav to save Hari as he is innocent. Aarav tries to save Hari by bribing the chief minister who reveals that Hari himself accepted his crime. Vasudha refuses to marry Aarav because Hari's action tells her that he sacrifices his life for them to be together. It is then revealed to Aarav that Hari deliberately accepts his crime so that Vasudha lives in guilt as she thinks Hari cedes for their love. In order to free Vasudha out of guilt, Aarav travels to the place where Hari is accused of killing, to prove Hari's innocent. Aarav meet Father Dayal who explains what happened with journalists and reveals Hari's innocence. On the way back to Mumbai, Aarav smells the scent of same flowers which first caused him to meet Vasudha, he went into the jungle without knowing that the place has mines, he accidentally stepped on one of the mines and smiles just before taking his foot of it.Vasudha gets the news of Aarav's death and gets shattered. Vasudha leaves Hari, who searched for her for two years, after finding her, she reveals to him that she knows about his fake sacrifice and tells him that she is not afraid of any traditions and boundaries, he warned her that she will come back to him one day. Hari waits for Vasudha twenty-one years in vain.

 

Back in the present, it is now distinct that the women who gets off from the bus was Vasudha and she wanted to reunited with Aarav where he died. In the end Hari takes Vasudha's ashes to scatter them at the same place where Aarav dies. In this sense Aarav and Vasudha reunite after death.