Most iterations of "Wal Katha 9" revolve around a protagonist who encounters a spirit or curse on the ninth day of the lunar month, or a family of nine members haunted by a vengeful mohini (a female demon of seduction).
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Unlike traditional Wal Kathas where a katthadi (shaman) saves the day, "Wal Katha 9" modernizes the solution. Sampath records the humming sound on his smartphone and plays it backward. He discovers that the hum is actually a counting chant: "Eka, deka, thuna, hathara, paha, haya, hatha, ata, nava..." (One, two, three... nine). When the chant reaches nine, the victim loses consciousness.