From Africa to Kazakhstan, a new Islamic network is attracting millions of followers - and billions of dollars.
Inspired by a little-known Turkish Imam, the Gulen movement is linked to more than a thousand schools in 130 countries as well as think tanks, newspapers, TV and radio stations, universities - and even a bank.
The movement's critics claim its aim is to gain power and spread socially-conservative Islamic values around the globe.
Its supporters say it's just the expression of a modern, business-friendly Islam committed to human rights, democracy and providing education for some of the world's poorest people.
Edward Stourton travels to Turkey to find out about the man who inspired what has become a global phenomenon - Fetullah Gulen.
There he meets supporters and critics of the movement.
He also learns about how its combination of faith, philanthropy and business is proving a winning formula in the developing world.
Producer: Helen Grady.
Edward Stourton investigates the new global network known as the Gulen movement.