| Director | Arivazhagan Venkatachalam |
|---|---|
| Genre | horror film |
| Runtime | 146 min |
| Country | India |
| Budget | $2.5 million |
Rooban, a paranormal investigator from Mumbai, travels to a medical college in Munnar to investigate a series of mysterious deaths. He meets Dr. Avantika, a lecturer who is writing a thesis to disprove the supernatural as mere psychiatric hallucinations.
Despite her skepticism, Avantika begins experiencing paranormal phenomena firsthand. This peaks during a violent encounter in the old library where she is attacked by spirits in Rooban's presence, leading to her hospitalization. Rooban discovers from a local casket maker that 40 years prior, the church-affiliated college took in 42 disabled orphans. Under the direction of Dr. Diana, the children were subjected to experiments involving the effects of sound on development. All 42 children died under mysterious circumstances and were buried in hidden graves.
Rooban and Avantika discover "Jennifer," a woman kept in a long-term coma. They realize "Jennifer" is actually Diana and that the medical staff, including the students who died, were tasked with keeping her heavily sedated under strange orders. Rooban theorizes that the constant anesthesia has caused Diana to have a prolonged out-of-body experience. He realizes the spirits of the 42 children are not the villains but are actually protecting Diana from those who wish her harm.
The investigation takes a turn when Rooban discovers a connection to black magic. He suspects that Dr. Daniel and his associates have been using occult practices to maintain the cover-up. Anyone who attempts to harm Diana or disconnect her life support—including the dean and the supervising doctor—suffers a gruesome, supernatural death.
Through audio analysis and a book on ultrasound therapy, the truth is revealed: the real culprit is Daniel's wife, Dr. Nancy. Driven by professional jealousy of Diana's success, Nancy used black magic and ultrasonic bat frequencies to torture the children. She was the one who attacked Diana and trapped the children's spirits. After killing her husband, Nancy attempts to finish off Diana. She uses a specialized hearing aid to protect herself from the lethal ultrasonic frequencies she employs through her magic. While Rooban plays the piano to stabilize the energy, Diana's spirit successfully returns to her body. The spirits of the children manage to remove Nancy's protective hearing aid, causing her to succumb to the same ultrasonic fate as her previous victims.
The film concludes with Rooban and Avantika visiting a children's home, where a recovered Diana is seen using her musical talents to provide genuine care and treatment to the children.