Spiral

Nandini is on trial for Guna's murder, defended by respected lawyer Chellappa, a father figure to Sakkarai. Chellappa invites Sakkarai to the Ashtakaali festival but is soon found dead in a locked cottage with a missing gun.

Amidst the festival chaos, Sakkarai grapples with the mute woman from the crime scene, desperate to uncover her identity. Nandini befriends a powerful inmate, while Malathy voices her mistrust of Inspector Moorthy.

A verbatim confession from the 7 young women who surrendered at different police stations, each claiming to have killed Chellappa sends Sakkarai's head spinning. He requests Nandini to be his eyes and ears in the sub-jail the women are lodged in.

Sakkarai diligently searches for connections among the eight women, and Nandini offers him a promising lead. Sakkarai uncovers Chellappa's fraught relationship with the local private school, revealing a potential motive for its owner, Prayamvata.

A stage play in the festival reinstates Sakkarai's resolve to find the young women justice. Sakkarai finds a pathbreaking lead at the crime site. With fresh forensic reports, he imagines the sequence of events on the fateful night.

10 years ago: Ravi and Naagamma are a happy, loving couple from the fishing community. Naagamma's world turns topsy-turvy when she discovers Ravi's dark secrets. She takes an extreme measure to set things right.

Sakkarai learns that Chellappa has been trying to crack and nab the kingpin of the human trafficking ring for the past 10 years. Shared grief brings Sundar and Dhamu closer. A shocking development sends Sakkarai on a time sensitive chase.

Sakkarai fixates on the case and nails Chellappa's killer. With the identity of their demon revealed, the 8 women gear up for revenge, but their demon puts up a formidable fight. Sakkarai goes on an epic chase to save the newly trafficked kids.