Set in the final years preceding Independence, Devil narrates the fictional account of a secret service agent aiding the British government in capturing Subash Chandra Bose. Amid Morse code messages, secret rendezvous and other clandestine elements typical of a spy film, Devil also folds in a murder mystery. It opens with the killing of a Zamindar's daughter, the circumstances of which prompt the British to send their most sought-after agent to not only solve the murder, but also uncover other mysteries that will inch them closer to Netaji's whereabouts. The agent's codename: Devil.