Nerariyan C.B.I. is Malayalam thriller film, directed by K Madhu and starring Mammootty, Mukesh and Jagathy Sreekumar. The fourth instalment in the C.B.I. investigative series, this movie is about the mysterious death of Mythili (Samvritha Sunil). Chacko and Vikram join Sethurama Iyer to find the murderer. Watch the full film, streaming online on Hotstar.