Former Al Jazeera correspondent Peter Greste, who spent 400 days in an Egyptian prison on trumped-up charges before being released this year, joined the Four Corners team on Monday. It's not a permanent arrangement -- executive producer Sally Neighbour says he is just doing the one story. "We're delighted to have him," she told Crikey.

We tried to tease out what he could be working on, but it appears that's being kept under wraps for now.