Ashutosh Gowariker is on cloud nine these days. Having directed Aishwarya Rai Bachchan in his ambitious project Jodhaa Akbar and Abhishek Bachchan in Khelein Hum Jee Jaan Sey, the versatile director has now roped in the patriarch of the Bachchan family, Big B himself! The Lagaan director is quite happy to have Amitabh Bachchan working in his next untitled film which is touted to be a big thriller. If reports are to be believed Amitabh will be playing a high-profile detective in this film. It’s a story revolving around two detectives unravelling a dark mystery, but Ashutosh is unsure about casting the second detective as he is doubtful anyone can match Amitabh’s acting skills and on-screen charisma. Well, Ashutosh can approach a certain Nana Patekar, wethinks! Remember the crackling chemistry the duo had produced in Mehul Kumar’s Kohram?