 Sethurama Iyer, the CBI Officer, comes to Kerala once again. But this time he is on vacation, spending his time with his sister and family. He has a visitor there, Fr. Gomez, who comes from Isow Alex, a convict awaiting his execution at the central jail. Upon Fr. gomez s request, Iyer visits Isow Alex, where he confesses that he had done six out of seven murders which was charged on him. He didn t do the last one. Now Iyer has to start the investigation before it is too late for CBI to correct the mistake. He starts investigating the case in his usual style.