Koi Jaane Na follows the story of a writer suffering from a writer’s block who sets off in a remote place to write. He secretly pens a crime novel too which translate into killings by someone. Who is the killer? The story is potentially a good thriller on paper. The screenplay is about the two halves. One of the major drawback of the film is its length. At almost 2 hours and 20 minutes, the film is way too long. Had it any any crisper with a runtime of around 100 minutes, this would have been excellent. And much of the fault lies in the first half where the buildup is far too long. The first killing takes place at the halfway mark which might be have been a little too late. A good chunk of the first half including some mindless songs and an insipid opening sequences could have been chopped off on the edit table. But if you do sit through the first half, the second half is rewarding. Things begin to flow as the thrill element is introduced. Here the writing is much better and will keep you engaged. If you watch closely, you will be able to guess the mystery but nevertheless the journey is fascinating with a nice little twist right at the end to play a littke with your mind. So screenplay is a mixed bag.