Ponmagal vandhal is set in Ooty in 2020. A local resident named 'Petition' Pethuraj (K.Bhagyaraj) is well known for filing cases against the general public to be in the limelight. Pethuraj reopens a case which happened way back in 2004, involving a serial killer 'psycho' Jothi who was convicted for kidnapping and murdering five children and two youngsters.