Twenty years on from the 9/11 terror attacks, former war correspondent Graeme Smith travels back through the cities and provinces of Afghanistan to try and make sense of the conflict.

The story behind the turmoil that's engulfed Australia Post. Four Corners investigates allegations of secret privatisation plans and proposed job cuts, and examines who was really standing up for whom. In interviews with key players, we ask the decision makers to explain their actions to the people of Australia.