Siddharth is the spellbinding tale of one father's journey across India in search of his missing son. Mahendra is a chain-wallah, making a living fixing zippers on the bustling streets of New Delhi. To ease his financial woes, he sends twelve-year-old Siddharth to work in a distant factory. When the boy doesn't come home for the Diwali holiday, Mahendra and his wife Suman slowly begin to suspect that he was kidnapped by child traffickers. With little resources and no connections, he travels across India to look for his son.