Ratsasan is a 2018 psychological thriller directed by Ram Kumar and starring Vishnu Vishal and Amala Paul in the lead roles. The movie follows Arun (Vishnu Vishal), a young filmmaker who has a passion for making horror films. Arun's life takes a drastic turn when he becomes a police officer and is assigned to investigate a series of murders that have been taking place in the city.
The killer is targeting young school girls and leaving clues at each murder site, suggesting that he will strike again. As the investigation progresses, Arun begins to suspect that the killer may have a connection to his past, and he starts to question his own sanity as he becomes increasingly obsessed with the case.
With the help of a seasoned police officer, Arun delves deeper into the case and uncovers a shocking truth about the killer's identity and motive. The movie creates a tense and thrilling atmosphere as Arun races against time to catch the killer before he strikes again.
Ratsasan was well-received by audiences and critics for its gripping storyline, compelling performances, and effective use of suspense and horror elements. It has been hailed as one of the best thrillers to come out of the Indian film industry in recent years.