The movie kick starts with the murder of Ayesha Mahajan, played by ('Baby' Saakshi Sem), who is the only child of her parents Aarti Mahajan and Sachin Mahajan portrayed by Tisca Chopra and Ashish Vidyarthi. With the police starting an immediate investigation, they interrogate each suspect and finally arrests Sachin Mahajan, the father as the 'prime suspect'. But certain loopholes are noticed by CBI Inspector Sunil Paraskar as he continues his search for the truth. The journey is not at all easy as he discovers many ugly truths which add to the mystery. The climax specially is cutthroat interesting, a fitting ending to a very well made film.
The actors have given excellent performances and Kay Kay Menon as Sunil Paraskar is impeccable as always and plays out an intense character with ease. Director Manish Gupta skillfully steers through the ups and downs of a murder mystery and ensures the audience is at the edge of its seats throughout.
The major film critics had all praise for the film, a few excerpts:
Vishal Verma from a Bollywood portal IndiaGlitz gave the film a three star rating and said, "Filled with snaky twists and turns UVI Film Productions 'Rahasya' backed by Viacom 18 Motion Pictures is packed by an absorbing spin. The talented Manish Gupta lives up to its demand of maintaining a dramatic rhythm and tension powered by terrific performance as the doctors of this genre ordered".
"If you enjoy murder mysteries then you must watch Rahasya. It's a well-made film", writes Rohit Khilnani from India Today.
According to Subhash K Jha from Bollywood Life Rahasya is, "A dark, sinister, gutsy and gripping thriller with a cutting-edge story".
Rahasya is Edge of the Seat Taut Thriller with impressive performances from lead cast & tight direction", reviews Box Office Capsule, rating it a crisp - 3.5 stars.
Nandini Ramnath from Scroll also has similar appreciation for the movie quoting, "Rahasya is an absorbing and stylish Agatha Christie-style whodunit thriller".