It may be the season of Thanksgiving, but a dark Thursday is coming for fans of the wildly popular podcast "Serial": There will be no new installment of Sarah Koenig’s engrossing true-crime investigation this week. A long weekend home with your annoying kid brother and that well-meaning aunt who keeps asking you when you’re going to meet someone nice probably sounds even more dull without an hour puzzling over the case of Adnan Syed and the tragic murder of Hae Min Lee. The special appeal of "Serial," in a media world already saturated with tawdry true-crime show, lies in Koenig’s willingness to grapple with her own shortcomings as a journalist and with the ethical dilemmas of crime reporting.