All over the world, governments are noting with concern the rise of a puritanical Saudi-style Islam, known interchangeably as 'Wahhabism' or 'Salafism'. But in India, while such statements are routinely made about 'Saudi-funded madrassas', they are not backed up with facts. Over the course of a month, we set out to investigate how 'Salafism' in India has grown, what are its known (and unknown) sources of funds, and what dangers it poses to a secular, diverse society. Watch the first part of our two-part investigation this week.