The film tells the riveting story of a complex murder case, parallelly investigated by a police officer and an investigative journalist in their own way, who eventually cross paths to unravel secrets they never imagined.

A criminal mastermind unleashes a twisted form of justice in Spiral, the terrifying new chapter from the book of Saw.

After an accident during their vacations on a paradisiac island, a group of friends is stalked by a large shark.

Saravanan (Pa Vijay) is a call taxi driver who experiences paranormal activities and he gets informed by a research student (Avni Modi) that a ghost wants to communicate with him. Later Saravanan comes to know that a small girl named Anu (Baby Yuvina) who lost her life in a bus accident which happened because of the negligence of a private educational institution wants to retaliate. Can Saravanan and Anu takes revenge against the rich correspondent of the educational institution ?

The movie begins in a bar, where an aspiring director meets his friends. One of his friend, Meenakshi Sundaram (Aadhavan) says he has a beautiful horror story script from his own experience and narrates what happened in his friend’s life.
Venkat (Vivanth), is a software engineer who is unlucky in whatever he does and is a sore loser. He is often taunted by his colleagues and is a loner. His only friend is Meenakshi Sundaram. One day, his boss at work admonishes him in front of the whole office for his performance, so in sadness he gets drunk that night and is involved in an automobile accident, where a young girl Divya (Eden), is killed. He panics and leaves the place and goes to his house.

There is a haunted house in Nandigama. Dead bodies of 34 people resurface in house’s well over a period of time. A TV channel plans to host a reality show in that haunted house.

Vaishnavi (Trisha) is a popular chef in India. Her friend’s fiancé Cotton (Yogi Babu) is stuck in a situation that demands him to go to London to work as a chef, but he is not qualified. He asks Vaishnavi to accompany him to pose as an assistant and help him secure the job. Vaishnavi agrees and travels to London with Cotton and a relative Balki (Swaminathan). They stay with Ganesh (Ganeshkar) and his wife Madhu (Jangiri Madhumitha) and work at a restaurant. Vaishnavi meets Sandeep (Jackky Bhagnani) there, and they fall in love.
One day, on a boating trip in a river, Vaishnavi injures herself and washes off her blood in the water. This triggers the vengeful spirit of a dead woman at the bottom of the river. She possesses Vaishnavi, who goes on a killing spree. Her friends experience numerous paranormal occurrences and find that Vaishnavi is possessed. The spirit turns out to be Mohini (Trisha), a lookalike of Vaishnavi. Meanwhile, Sandeep proposes to Vaishnavi, and they get engaged. They meet Sandeep’s mother Menaka (Poornima Bhagyaraj) and his father Vicky/KVR (Mukesh Tiwari). Mohini is enraged seeing him, and this reminds her of why she was killed.

The film is a love story with elements of horror. The protagonist is a man who shows off his bravery and also manages to scare ghosts.

A doting wife goes through a hard time trying to save her husband who is possessed by two spirits.

A shape-shifting snake-woman, who is in search of her lover, who she lost two decades ago, sets out to win his love again.

A teenage girl in the Midwest becomes infected by an outbreak of a disease that slowly turns the infected into cannibalistic zombies. During her transformation, her loving father stays by her side.

6 Athiyayam is an anthology with 6 parallel stories that are correlated and the climax of each story is revealed only in the finale.