The temple is closed from 6 pm every evening until 6 am the following morning. It is believed that Siddhars enter the temple past its closure for the day, and perform their rituals and prayers and leave before dawn, and anyone who disturbs the prayers of the Siddhars is done away with by the guardian of the temple, Kaalabhairavar, who is believed to guard the temple during the night in the form of a dog. This belief attracts a number of rationalists to the temple, who want to try and solve the mystery. One such rationalist, a journalist names Srikanth (Indra Soundar Rajan), hides in the temple when it is being closed for the day, in an attempt to find out what really happens in the temple in the dark. However, as if the villagers' fear is made true, Srikanth is killed by a dog while he is inside the temple. Hence, the entire village is convinced that the temple of Chitheshwarar is actually a den of heavenly Siddhas who pray during the night, leaving ordinary people to pray during the day.