"Serial" is a new podcast from the team at "This American Life," where one long story unfolds bit by bit, week by week. Sarah Koenig, host of "Serial" and producer at "This American Life" along with founder and host of "This American Life" and the editorial adviser of "Serial," Ira Glass, discuss the first season, about the (ostensibly solved) murder of a high school girl near Baltimore back in 1999.