Plot
A newly engaged couple, Stella and her fiancé Rimson, disappears during a trekking trip in an unspoiled forest. This event prompts four members of the SAR Komodo Team: Darwin, Asti, Herman, and Petra, to initiate a search for them. The team conducts their mission through the rugged terrain and encounters Samantha, convincing her to join their efforts. They finally reach the entrance of the forest, only to find the pathway blocked, forcing them to continue their journey by climbing the hilly road deeper into the woods.
After setting up camp, the SAR Komodo crew urges Samantha to explain why she entered the forest. Samantha retorts that they should abandon their search and rescue mission. Moments later, they suddenly hear strange noises and witness supernatural phenomena that compel them to venture further. During this excursion, Samantha discovers Stella's red shawl and reflects on a previous encounter with her mother, Mega N. Widjoko. Mega had asked Samantha to go to Ujung Sedo, located at the edge of the deep forest, to eliminate her wangsit regarding the Kuntilanak.
The next morning, a thick mist appears unexpectedly, disrupting their equipment. Pushing through the fog, Samantha and the others later follow Yenny, the daughter of Sam's landlord, who had been kidnapped by the Kuntilanak in the second film. They trail her until she vanishes at the mouth of a cave. Without a clear direction, they enter the cave and split into two groups. They experience terrifying events and unexplainable encounters. In the climax, they manage to exit the cave with a warning: Samantha must go to the home of Mbah Putri, the source of the Kuntilanak's wangsit within the Mangkoedjiwo family.
As they set up camp in a clearing, Samantha reveals her reason for being there and ominously declares they have arrived at "Ujung Sedo." While everyone sleeps, the Kuntilanak haunts Herman, causing him to fall into quicksand. The remaining four search for him the next morning and stumble upon a ghostly village. The group finds a cow carcass alongside a crying baby. Despite warnings from others not to take the strange child, Petra picks up the baby. During the night, the baby goes missing, and when Petra ventures out to search for her, the Kuntilanak attacks her. Afterward, Asti, Darwin, and Samantha go out to look for Petra. Samantha encounters Yenny again and follows her to a field covered in fallen leaves, where she sees a group of blind children chasing a white horse.
In pursuit of them, Samantha manages to catch up with Yenny and, while hiding, witnesses the Kuntilanak collecting children to suck out their souls for sustenance. As Yenny and Samantha flee, Darwin, who has seen the Kuntilanak, takes his own life after being enchanted by her. On their way to Mbah Putri's house, Samantha meets Asti, who promises to help her survive. Eventually, Yenny and Samantha reach Mbah Putri's dwelling. Confronting Samantha, Mbah Putri reveals the origin story of the Kuntilanak, a vengeful spirit of a mother killed after giving birth to the devil's child, a fate similar to hers. The now 100-year-old Mbah Putri agreed to carry the child in her womb as part of a pact for immortality.
Mbah Putri composed the Durmo (or the Chant), sung by Samantha and all the Mangkoedjiwo descendants, to summon the Kuntilanak. The Kuntilanak replenishes the strength of the devil's spawn using the souls of murdered victims, enabling it to survive in Mbah Putri's womb. Samantha realizes she cannot eliminate the wangsit as long as the child is alive. Her encounter with Mega was an illusion created by Mbah Putri to lure Samantha to Ujung Sedo and make her the replacement host. Afterward, Mbah Putri sings the Durmo and releases the devil's child, which crawls into Samantha's womb. Later, Samantha tells Yenny to go to the rescue point; she climbs to the top of the waterfall and jumps off, hoping the child will die with her.
Asti, Yenny, and the other captives head to the rescue point, and a helicopter descends to save them. Meanwhile, a hand, possibly Samantha's, emerges from beneath the stones of the waterfall.
