Thottappan starts with the story of two thieves in an island village of Rural-Kochi, Ithakk and Johnappan. They both are hard-core friends and operate robberies together for years. Once, after the theft of a golden idol, they were hiding the idol under an abandon pond. Immediately after reaching the upper water, on the way to home, Johnappan said to Ithakk that he is going to be the Godfather for his new-born daughter (Sarah) in her baptism ceremony.