Sethurama Iyer, the iconic role of Mammoottty in his CBI franchise will soon be back with the 5th edition. Mammootty - Madhu - SN Swamy are the terrific trio behind this popular thriller franchise and once the lockdown is lifted, the megastar will join the team. The writer Swamy says that CBI 5 will have 'Basket Killing' as its plot. He promises that the audience would be treated to this unfamiliar theme. It is known that the Sethurama Iyer character is one of the celebrated roles in Mollywood where the CBI officer solves the toughest of cases for CBI.