I have arranged to meet our pirate, somewhat incongruously, in the desert. I board a 1960s prop airplane that smells of goat and is piloted by four portly Russians. After a series of short hops across Somalia’s northern wastes, we touch down on a red-dirt strip outside the town of Galcayo. The government in the …

Sudan’s separation was meant to end decades of civil war. Instead it has created two weak states and more conflict High in the Nuba Mountains in central Sudan lies a green valley of guava, mango and custard-apple trees where the people live in conical grass-roofed huts, tending goats and raising maize and sorghum on steep …