A young Art College student Aditya Chaterji finds his backpack and belongings stolen on the day of a political strike called by the infamous political party of Calcutta. Meanwhile Bakul Bihari faces the opportunity of a lifetime to win big for his glorious though covetous efforts to help a poor boy in distress. Cab driver Rasul Ahmed discovers a bomb in his backseat at a congested traffic signal in an extremely unpredictable and sensitive slum area of Calcutta. Set in the grimy backdrop of a city going through a political crisis, Calcutta Taxi unravels the story of three lives that coincide and affect each other. Each one having lost and found some things in this chance encounter of life.