Deyyam is about Murali and Sindhu (Jayasudha) a happy couple who purchase a farmhouse near a graveyard. Their 3-year-old son Chinni claims to have invisible friends and starts interacting with thin air. On further prodding, Sindhu's sister, Mahi(Maheshwari) and her boyfriend Narsing (JD Chakravarthy) figures out the house is haunted. Will the family manage to escape or not is the story of Deyyam.