What is the best book to learn about the history of Sufism?

by ray_guns_are_back

I am suddenly overcome by a curiosity about the Sufis. I know next to nothing about them but would love to know the best source to remedy this.

AManWithoutaT

Try Nile Green's "Sufism: A Global History" (Wiley-Blackwell, 2012) WB publishes solid work.