It's quite evident that Manish Gupta's Rahasya is somewhere inspired by the high profile Noida double murder case of Aarushi Talwar and Hemraj. Here the setting is Mumbai and instead of Delhi cops it's Mumbai police doing the interrogation till CBI takes over.

A murder mystery after a very long time that grips you in the first half. Excellent acting by Kay Kay Menon who makes a fine CBI officer and solves the case like Sherlock Holmes.

The film starts off with the murder of Ayesha Mahajan ('Baby' Saakshi Sem), the only daughter of her parents Aarti Mahajan (Tisca Chopra) and Sachin Mahajan (Ashish Vidyarthi). As soon as the police start investigating the case, the needle of suspicion moves from one person to the other. After having interrogated the suspects, the police then arrests Sachin Mahajan on the basis that he is the 'prime suspect'. When he is cooling his heels in the jail, there enters the CBI Inspector Sunil Paraskar (Kay Kay Menon), who, after discovering that Sachin is innocent and is being falsely implicated, goes on a mission to nab the actual culprit. During this journey, he discovers (read 'uncovers') many ugly truths. Added to this are the twists and turns in the story, which also includes a string of murders.

Half of the star-rating extra for the sheer abundance of acting talent that Manish Gupta's stylish confidently-shot whodunit throws forward, with Kay Kay Menon helming the murder mystery as an walnut-chomping CBI officer on the trail of the murder of a young girl, who is killed in her swanky home while her doctor-father was drunk in the next room.

When Aayesha (18) is found dead in the bedroom of her plush Mumbai residence, the cops suspect her father Dr Rajesh Mahajan (Ashish Vidyarthi) to be the culprit. However, CBI officer Sunil Paraskar (Kay Kay Menon) smells a rat. He feels there is more to this convoluted case than meets the eye. He begins his investigation, which puts his life and those involved on the line.