Thursday, Doug is back in the studio with the latest installment of our Through the Lens documentary series. Our guest is Carl Colby, whose latest film is about his father William Colby, spymaster and former head of the CIA. The film is Carl's search for an authentic portrait of his father, a man whose life was obscured even to those closest to him. It's part memoir, part history of the CIA. Really, it's about the costs of what a country does in secret.