Politically engage young writers are supposed to mellow when they grow old. With experience and recognition, you somehow expect them to become more settled in their chosen craft, less fired-up, more removed from the fray. But not Wole Soyinka. Twenty years after winning the Nobel Prize for literature, the first African to do so, he has pitched himself back into the seething politics of Nigeria, "the place I never should have left". [David White reviews Wole Soyinka's autobiographical work.]