As Sonali and Kundan are about to meet up with their friends, they are chased by three goons. The goons end up murdering Kundan but spare Sonali. Meanwhile, Sonali's twin sister, Monica is traveling in a train, towards Mumbai. However, the journey turns out to be her last ever, as another girl drugs the passengers in the entire coach and kills Monica. Learning of Monica's murder, CID arrives at the train and begins investigation. The CID team is later informed about a girl in Delhi who looks exactly like Monica. Intrigued by this new development, the CID team reaches Delhi and meet up with Sonali, who informs them about Kundan's murder and the three goons who have been chasing her for long. How will CID solve this complicated case, that involves drug smuggling in Delhi?
