Nancy Sanford asked Graeme Simsion:

This question contains spoilers… (view spoiler)

Graeme Simsion Glad your enjoying it. I'm thinking about a third (and last) book in the series, but there will be a couple of non-Don books first. The next one- THE BEST OF ADAM SHARP - is about a relationship re-kindled after 22 years and then I'm working on one with my wife - a love story set on the Camino de Santiago de Compostela, the famous pilgrims' walk. So a year or three yet till you see Don again.
And I'm in favor of satisfying endings - even if it stops me winning literary prizes...

flag