Chennai -- Filmmaker Mani Ratnams upcoming film Kadal, starring Gautham and Samantha, is a love story that revolves around a church in Tuiticorin, according to sources. Since the director was not allowed to shoot inside the church, he had to opt for a set. Besides directing the project, Ratnam is producing Kadal under his production banner Madras Talkies. Jeyamohan has written the script of Kadal along with Ratnam. The music of the film has been composed by none other than AR Rahman. Apart from the script, Jeyamohan has also penned lyrics for a couple of songs for the film.