In an interview with Digital Spy, the movie's director described the many difficulties of shooting the suspense drama, centred around a police investigation.
"Oh God! There were so many hard things about making Talaash," she explained. "The first scene was the toughest bit. There was the water sequence, which Aamir [Khan] had to learn to swim for, just for this film.
"I think initially we had a bit of a problem casting it, but we got Aamir and then we took a decision to shoot on locations in Bombay. That was hell - with special mention to my production and AD departments for pulling off the almost impossible.
"I think finally when I got to the edit, it had me sitting for a lot longer than we all had been anticipating. I think because Talaash was dealing with darker emotions and things that are not considered to be the stuff of commercial Hindi films, it was in general a harder film to make."
The Honeymoon Travels director, who co-wrote the script with filmmaker Zoya Akhtar, described the script-writing process as a highly personal experience, often drawing on aspects of the writer's own life.
"The process of writing is something very, very personal," said Kagti. "If not consciously then unconsciously. You are deriving everything from the unconscious, so in a very disguised way, who you are and where you are in your own life will have some kind of effect. I'm sure if another writer took the same idea in ten years from now they would come up with a very different screenplay."
While the film's cast and director have remained necessarily tight-lipped about the plot, Kagti revealed the origins of the story, saying: "It is a suspense drama. I don't want to shoot myself in the foot by telling you too much about it. I can't tell you what it came from exactly, but Zoya and I were just sitting and hanging out and it just came from something she said to me in passing that we were bouncing around as an idea. And it sort of developed into a story."
Starring Aamir Khan, Kareena Kapoor and Rani Mukerji, Talaash releases on November 30.