Kaalo is based on the story of a Rajasthani folktale about a witch named Kaalo, who was killed and buried by angry villagers of Kaligarh 600 years ago. Villagers believe Kaalo's ghost looms over Kulbhata. The village has been deserted because the villagers feared that Kaalo's ghost may return to take revenge. Year's later villagers spoke of Kaalo's sightings yet again. All roads leading to Kulbhata were sealed by horrifying tales of Kaalo killing anyone who dared to enter Kulbhata until a bus carrying eleven passengers on its way to Kuldevi had to pass through Kulbhata. One of the passengers on the bus was a twelve-year-old girl named Shona who was traveling alone to spend her vacation at her grandmother's house in the neighboring village. Shona was clever, witty and cheerful. She soon became the life of the journey. Badly disfigured and thirsty for blood, Kaalo could smell the girl from miles away and headed straight for the bus. She would kill everyone who came in her way, she had to have the girl anyhow. When the passengers suddenly realized they were staring into death everything changed. From being the life of the journey, Shona became their very reason for dying. Everyone wanted her out of the bus. One man stood up to Shona, but for Sameer it didn't matter if Kaalo was a creature or a witch. All he knew was that he has to protect Shona at any cost because time was running out!