'Blackmail' is a story about a cop (Sunil Shetty) and a criminal (Ajay Devgan). The criminal wants to get even with the cop for having put him behind bars and he does so by kidnapping the cop's kid when he gets out of the jail.
Story of a tumultuous and complex relationship between a father (Mohan Agashe) and son (Ajay Devgan), set against the backdrop of a thriving kidnapping industry in the Hindi heartland of Bihar.