In 17th-century Kerala, folk singer Thevan (Arjun Ashokan) discovers a mysterious mansion and encounters enigmatic cook Servant (Sidharth Bharathan), a powerful master Kodumon Potti (Mammootty), setting in motion a chain of events that changes his life. As Thevan befriends the cook, he learns that Kodumon is a sorcerer who has chained a vengeful chathan in the attic, and that the cook is Potti's illicit son, seeking revenge against his father.