Hari, a Chennai-based software engineer, falls in love with Pooja. After having settled in life, Hari returns to his village in Kerala, years after falling out with his father. Pooja too arrives and does her best to reconcile the estranged father and son.

An adaptation of the Hollywood film Trapped (2002), which itself was based on Greg Iles's novel 24 Hours, the film also borrows premises from the Canadian film Butterfly on a Wheel (2007).

Attempting to kickstart his career, Karthik makes a documentary on Alzheimer's disease. His subject, Malathi Menon, lives in a small town outside Harippad with her daughter Athira. Karthik and his team arrive at Malathi's place and start noticing Malathi's unexplainable behavior, where she starts speaking in an ancient language and scribbling on certain pictures.