The film tells the story of St. Thomas who reached Kerala in 52 AD to spread the Christian faith among Jews and locals who are today known as Saint Thomas Christians or Nasranis. He established Ezharappallikal or Seven and Half Churches in Kerala. These churches are at Kodungallur, Palayoor, Kottakkavu (Paravur), Kokkamangalam, Niranam, Nilackal (Chayal), Kollam and Thiruvithamcode (half church). He was killed in 72 AD, attaining martyrdom at St. Thomas Mount near Mylapore, Chennai (Thus getting the name).