Antervyathaa is a romantic thriller drama where a young man who is suffering from fear disorders and illusions helps an investigating officer to solve a case. Despite using the young man’s experiences with fear, the case turns complicated leaving the investigation with more unanswered questions. The police officer believes that they could use the feeling of insecurity, distress, and fright a criminal feels right after committing a crime to catch him. How does the young man crumble under his own fear of getting caught leads to the climax of this psychological thriller.