BBC History Magazine has done a podcast of Michael Haag talking about his new book, The Tragedy of the Templars.
The podcast can be listened to by clicking here.
The talk with Michael Haag begins at 16 minutes and 24 seconds into the podcast and lasts for half an hour.
Or go to the list of podcasts on the BBC History website by clicking here, and then scroll down to 17 January 2013.
The podcast seems to work best with the Chrome browser.