A haunted curve in 1990s Kerala, named after Sumathis tragic death, draws various people into supernatural encounters. As they experience strange events, the mystery of Sumathi and the roads dark history begins to unfold.

Abraham Mathew Mathan aka Paappan, a voluntarily retired S.P. from the Crime Branch who is unwillingly reinstated to the force for investigating a long-standing murder case.

Appu is a young homestay owner in Goa. He lives with his father, mother and younger sister. His father Baba is a retired goon who got tricked and surpassed by Abusi one of his followers. Amidst all the problems caused by his friend Macroni, Baba and Abusi, a young Malayali girl Zaya comes into his life on a Russian New Year eve. How her relationship with Appu affects his life is the soul of the film.

Aryan's life turns on its head after he is falsely accused of committing a murder. Fortunately, he soon finds a friend in Rajeev, the investigating officer, who helps him prove his innocence.

Kannan is a gangster who rules the crime-infested town of Kotha. After getting humiliated by Kannan and his men, CI Shahul Haasan tactfully plots the return of former gangster named Kotha Rajendran alias "Raju", thus leading to a transformative turn of events.

Dominic, a disgraced ex-cop turned detective, takes on a seemingly simple case to locate a purse's owner, which unveils a dark web of missing persons, murder, a stalker and the mysterious dancer Nandhita.