Aatish is the story of two brothers Baba (Sanjay Dutt) and Avinash (Atul Agnihotri). In the quest of forwarding an educated and dignified life to his yourger brother Avinash, Baba meanders onto the unethical and criminal path by working with `Uncle` (Ajit). When Avinash finally completes his studies and becomes a polie officer he is handed a list of the city`s most wanted criminals. To his horror, his brother`s name is on the list. Avinash must now decide to proceed on with apprehending Baba, or quit from the police force.