Graham's newest book is called Underworld: The Mysterious Origins of Civilizations. It looks really good.

By the by, I wouldn't recommend thinking about moving to Toronto, Jenn... we just got killed with somewhere around 40cm of snow. Unless you want to write Honkus about hydroplaning to and from work with stupid ass SUVs driving at top speed, and then spinning out of control into the ditch... which really... does make for good comedy.