Kalam is a suspense horror that is set in a haunted house. When a married couple move to their new house and start living there, they witness some unusual, scary things. In an interview with Galatta, art director Senthil Raghavan says that they travelled across the length and breadth of Chennai for over a month to find the most apt location for Kalam. Finally, they found the perfect house. More than 70% of the film was shot in that house. The house is the soul of Kalam.