While his peers have all turned white, Katak is still small and grey. To prove that he has grown up and to grant the last wish of his adored grandma, Katak departs on a perilous journey to the Great North.

A writer who studies the paranormal believes that low frequency tactile sound is the cause for reported ghost sightings in an abandoned subway station. In an attempt to debunk the sightings, she breaks into the station to record evidence.