Yakeen is a romantic thriller drama. The movie revolves around Nikhil Oberoi (Arjun Rampal), who is married to Simar (Priyanka Chopra). The two meet with an accident and Nikhil suffers most injuries, along with loss of memory. However, Simar’s love and care win him over. After a few months of therapy, he is finally released from the hospital and returns home. He decides to go through his personal files and documents, which give him evidence from his previous life. He finds out that on the night of his accident, he was going to divorce his wife. He grows suspicious of his wife and hires a personal investigator, and the investigation reveals that Simar has an affair with a man named Kabir and wants to get rid of Nikhil. What turn will this revelation bring in their married life?