Tahaan - A boy with a grenade" is a fable-like journey of the eponymous eight-year-old boy, whose life revolves around the pursuit to find real purpose in his little world. Tahaan (Purav Bhandare) lives with his grandfather (Victor Banerjee), his mother Haba (Sarika) and older sister Zoya (Sana Shaikh,) in the serene meadows of Kashmir. They all live in the hope that someday Tahaan's father, who's been missing for over three years, will return. The death of his grandfather leads the local moneylender Lalaji and his manager Kuka (Rahul Khanna) to take away the assets of the family, including their pet donkey Birbal, against repayment of a pending loan. Now, life for Tahaan, his mother and sister takes a turn towards rougher pastures. For Tahaan, bringing his favourite donkey Birbal back home becomes the sole purpose in life.