If you haven't been listening to Serial you've surely been hearing about it, so I won't summarize the whole story other than to say that there are three critical characters here. There's Hae Min Lee, who was brutally strangled 15 years ago, Adnan, her ex-boyfriend who's currently in jail for life for her murder, and Jay, their mutual friend who claims Adnan admitted to killing Hae and showed him her body. One of three things is happening—Adnan's lying, Jay's lying, or they both are.