The film, set in Mumbai, revolves around a mistaken delivery by the Dabbawalas (lunchbox service) of Mumbai, which leads to a relationship between Saajan, a lonely widower close to retirement, and Ila, an unhappy housewife, as they start exchanging notes through the daily lunchbox.

Raj Malhotra and wife Pooja have four sons. The sons have settled down professionally and are quite independent. However, when Raj Malhotra retires, none of his children want to be burdened with the responsibility of taking care of their parents. Strangely, it is the adopted son who proves to be the most kind hearted of them all. Salman's girlfriend eventually marries him. The question is, will Raj and Pooja's sons learn the folly of their ways and turn over a new leaf?