David Williamson is far and away Australia's most produced playwright. For the past 50 years he's been writing plays at an average of one every 10 months — not counting all the screenplays he has written. Now at the age of 79, David Williamson has retired, and he looks back on his luminous career in a very candid memoir called Home Truths (HarperCollins), in which he throws open the doors to his writing room and takes us inside.