In Mumbai, home to over 18 million people, more than 5,000 famously efficient dabbawallas — lunchbox couriers — navigate chaotic streets to deliver lunches, lovingly prepared by housewives, to working men across the city. Ila (Kaur) is a housewife living in a middle-class neighbourhood with a husband who ignores her. Saajan (Khan) is a beaten down widower about to retire from his number-crunching job. After Ila realizes that Saajan is receiving the meals meant for her husband, the two begin sending each other letters through the lunchbox. What starts as an innocent exchange about Ila's cooking gently develops into something more. Outside the space of their daily lives, both Ila and Saajan feel free to express themselves in new ways, leading them both to question how they might find happiness.