The FT's 'Isis Inc' series is the most difficult, important and revelatory investigation the Financial Times has done in years. It exposed for the first time how the jihadis raise - and spend - their money and run their affairs. It also underlined the failure of the western air campaign to dent its organization and revenues. The power of the reporting was reinforced by a host of telling graphics and interactives. “How oil fuels terrorists” was our most read story of the year.