Synopsis:

Avantika (Kareena Kapoor) is a teacher in a university in Delhi. She has come back from New York where she teaches, because her father has suffered a heart attack. During this period, she meets a temporary Professor called Ehsaan Khan (Saif Ali Khan). Soon they begin seeing each other and love blossoms. A few months later, Avantika receives a call from her university in New York, asking her to come back for the Fall Semester. Avantika breaks the news to Ehsaan. He in turn, tells her he doesn't mind coming to the States with her, to find a job. But first they need to get married.

Soon after the marriage, they leave to start a new life in New York. They buy a house in an Indian neighbourhood and move in. Just as they are setting up home, their conservative Muslim neighbours, Hamid and Anjum, invite them over for dinner. The next morning, Salma (KironKher), one of the women Avantika met the night before at the dinner, visits her under the pretext of gifting her sweets. When Avantika invites her in, Salma tells her that she is in grave danger. Nothing is what it seems. Salma pleads with Avantika to help her.

Avantika discovers that her husband (Saif Ali Khan) is not professor but a mastermind terrorist who used her to protect his identity.

Avantika gets to know that Ehsaan and his men are planning to hijack and bomb an aeroplane, which a high profile TV journalist (Vivek Oberoi) who works with a big news network in USA is going to board. What follows next, is a series of incidents that sucks Avantika into a vortex of danger and intrigue. As her life spirals out of control, Avantika realizes that she is a pawn in a huge game. And no one is to be trusted.