Ratan Mestry, a 62-year-old dabbawala, has delivered lunch to businessman Ashok Deshpande every working day for 31 years. When Ashok suffers a heart attack, Ratan takes the tiffin to the hospital. There he meets Ashok's estranged son Vivek, and through a shared meal, two strangers discover how deeply one old man's quiet devotion held a family together.