In a war-torn city, Chandra fights a female assassin sent by
Ishtar and escapes from a ruined building. In the present, Chandra is summoned from
Sweden to
Bangalore by Prakash and learns that the summons came from
Moothon ("the Elder"). She obtains a fake passport & learns about
They Live Among Us, a book credited to the pen name Joseph Dominic that describes detailed chronicles of supernatural beings, similar to the legendary
Aithihyamala. In Bangalore, Chandra lives quietly, working night shifts and is visiting the Holy Grail Café, owned by her ally Johny. Across the street lives Sunny and his friends Venu, a
MBBS dropout student and Naijil. Sunny develops feelings for Chandra, though she remains distant. Her powers are revealed when she intervenes to protect a co-worker from Sundar, a member of an
organ trafficking ring led by crime boss/politician Gajendran and supported by Inspector Nachiyappa, a corrupt cop. Nachiyappa becomes suspicious of Chandra after learning that she had attacked Sundar violently. Chandra also saves Sunny from an accident and is subsequently invited to Naijil's birthday party. Their cat is scared of her presence and Chandra is visibly uncomfortable with the sight of blood. Sunny begins to suspect her after seeing Kumar, a known criminal associate, regularly deliver sealed containers to her. His doubts increase when Naijil briefly disappears (though it is later explained he was detained by police). Chandra is later abducted by Sundar and his men, but she manages to kill them and escape. Sunny, attempting to rescue her, witnesses her powers. She confirms to him that she is a
Yakshi. Somewhere in the city, Verghese Kurien, narrates to his granddaughter the legend of
Kalliyankattu Neeli: a tribal girl whose village was destroyed by a king enforcing
caste segregation and after being bitten by a bat, developed supernatural abilities. After the king's men killed her parents, she killed them in revenge and became a guardian figure and a nightmare for wrongdoers. She was later recruited by legendary priest/sorcerer
Kadamattathu Kathanar to serve Moothon. Verghese is revealed to be Joseph Dominic, and Chandra is revealed to be Neeli, now immortal. Sunny later wakes up in Chandra's room and discovers her vulnerabilities when he witnesses her skin being burned by sunlight and healed by consuming
packed red blood cells, the very contents of the containers supplied by Kumar. Later, Nachiyappa confronts Chandra while investigating the murders of the organ trafficking gang members, and during their fight, she bites him. Sunny and his friends arrive during the struggle, and Nachiyappa accidentally shoots Sunny before fleeing. Chandra then takes Sunny and his friends to the abandoned
Michael’s Clinic. Subsequently, media reports label Chandra and Sunny as terrorists due to the attack on Nachiyappa and the deaths of the gang members. Chandra tells Sunny to inform the media and police that Sunny had nothing to do with it, and it was all Chandra's fault, if he is arrested. Nachiyappa begins mutating into a
yaksha as a result of Chandra’s bite. Verghese visits him, warns him of Chandra’s true identity, and collects a blood sample of his. At the clinic, Chandra explains her weaknesses—sunlight and her heart, which is fatal if directly attacked—and clarifies that her bite can transform only healthy individuals into yakshas, while others succumb to a
rabies-like illness. Two policemen raid the clinic, during which Chandra is shot in the head. She is rescued by Michael, who is revealed to be a
Chathan keeping a low profile as a
street magician. Michael uses hallucinations and illusions to defeat the police officers and escorts the group to the Holy Grail Café. There they pass through a bloody hallway being cleaned and notice a mysterious hooded figure. Chandra shows Sunny a photograph of her lover, Michael Joseph, a
British officer from 1905 who resembles him. It is also revealed that Johny is a descendant of Kathanar. Meanwhile, Nachiyappa begins to enjoy his newly acquired powers and develops a
god complex. He attempts to bite his mother in an effort to make her immortal, but she dies. Meanwhile, the cafe is surrounded by the government’s Garuda Force, who try to appeal to Chandra in surrendering; unwilling to do so, the Garuda Force barges in to the cafe. Chandra successfully takes them down but is quickly targeted by Gajendran’s men, who shoot her heart, fatally injuring her. However, she heals herself by consuming a blood packet provided by Sunny and defeats them. Nachiyappa, who has fully transformed into a yaksha, confronts her in front of Sunny, Naijil, and Venu. After a bloody fight, she kills him by stabbing his heart with a dagger. Afterwards, she retreats underground, saying goodbye to Sunny. In the mid-credits scene, the mysterious hooded figure is revealed to be Charlie, an
Odiyan, who had eliminated the traffickers from the syndicate who came for a parley. In the post-credits scene, Michael is being questioned by a man about a group of archaeologists who disappeared inside a cave after traveling with a monk; the monk went only partway, while the archaeologists ventured deeper and never returned. Only a camera was recovered, containing a photograph of a man identical to Michael. Michael responds that the photo is of one of his 389 siblings. == Cast ==