The DVD contains embarrassing CCTV footage of Armaan and his friends leaving a hotel with a girl. Eventually, the police find Sashi's body at the bottom of the river, along with a bag containing the blackmail money and a DVD. Through Rosie, Surjan finds out about Sashi's connection with the case and starts a manhunt for Sashi. Surjan declines Rosie's advances but asks her if she can become an informer. After an upsetting conversation with his wife, Surjan drives off one night and is propositioned by an escort who calls herself Rosie (Kareena Kapoor). Meanwhile, Surjan's wife, Roshni, begins to seek solace from a medium (Shernaz Patel) who claims that she is in touch with Karan's soul. Hearing nothing more from Sashi, Taimur surmises that he has been killed and begins to use Sashi's old sim card to blackmail Sanjay with Sashi's murder. In panic, Sanjay employs some thugs to murder Sashi. Sashi begins sending blackmailing calls to Armaan's friend, Sanjay. However, Sashi's friend, Taimur (Nawazuddin Siddiqui), steals Sashi's discarded sim card. Once he learns of Armaan's death, Sashi takes off with the cash, leaving behind a mistress, Mallika (Aditi Vasudev). Three years back, Sashi had performed a cover-up for Armaan and his friend Sanjay Kejriwal (Suhas Ahuja).

In fact, the blackmailer is a pimp named Sashi (Subrat Dutta). Surjan suspects that Armaan had given the money to a blackmailer a little while before the accident. 2 million in cash, which is missing from the car. He learns that on the night of Armaan's accident, Armaan was travelling with Rs. Surjan focuses all his energy in the investigation. His wife, Roshni (Rani Mukerji), is still grieving and Surjan has developed a guilt complex. Surjan's personal life is in turmoil since his 8-year-old son, Karan, drowned during a family outing. Inspector Surjan Shekhawat (Aamir Khan) begins an investigation into Armaan's death. Well-known actor Armaan Khan (Vivan Bhatena) loses control of his car for no apparent reason and drives into the river.

The film opens with a late-night car accident on a deserted road.

The synopsis below may give away important plot points.

What looks like a simple car accident investigation turns into a haunting mystery as further investigations show many anomalies stringed to the death of the victim. Being on his investigational quest and fighting it out with personal struggle, Inspector Shekhawat meets a sex worker Rosie played by Kareena Kapoor who further adds shades of mystery to the puzzle. The case turns into a life altering chase for Inspector Shekhawat when he is forced to reel under the repercussions of a broken married life with his wife Roshni played by Rani Mukherji and come face to face with his suppressed grief. Aamir Khan plays an investigation officer, Inspector Shekhawat who receives a phone call early in the morning informing him about death and an accident and how everything starts to unfold from there. Suspense at its core, Talaash explores Mumbai's underbelly like never before. Seeing reflections of Mumbai under the red light, Talaash is a tale of love lost, fatal attraction and above all the quest to solve a perfect crime. Inspector Surjan Shekhawat, who is dealing with a depressing past, has to investigate a high profile murder case, deal with his crumbling marriage and use the help and solace of a prostitute by the name of Rosie.

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