"Serial" returns Thursday with a new episode following last week's hiatus. For the uninitiated, the podcast focuses on Adnan Syed, who in 2000 was convicted of murdering his ex-girlfriend, Hae Min Lee, and sentenced to life in prison. Syed has maintained his innocence in the 15 years since Lee's murder. Journalist Sarah Koenig hosts "Serial" and spends each podcast peeling back layers of Syed's case, making valid arguments for and against his conviction in the process. (Meanwhile, an appeal hearing for Syed has been set for January.) Nine episodes in, "Serial" has created more questions than answers for its totally obsessed listeners. We know, because we're part of the 1.5 million people who download the show each week (and then loudly debate it in the Huffington Post newsroom). Ahead, 13 burning questions to ask about "Serial" before the debut of Episode 10.