Lost is a mystery thriller inspired by true events that are set in Kolkata and revolve around a crime reporter Vidhi Sahani (Yami Gautam) who investigates the case of the sudden disappearance of a young theatre activist and college student named Ishan Bharti (Tushar Pandey). During her investigation, Vidhi gets to know different versions and theories from Ishan’s society associates regarding his sudden disappearance including his family and girlfriend Ankita (Pia Bajpayee). As Vidhi digs deep into the case she realizes there’s more to it with one end leading to another and not what is being portrayed so far by various sources. What really is the true story, will Vidhi ever get to know the truth?