Sarah Koenig tells the story of the murder of Hae Min Lee, a popular high-school senior in Baltimore County, Maryland. She disappeared after school one day in January, 1999. Six weeks after her disappearance, police arrested her ex-boyfriend, Adnan Syed, for the crime. Though he was convicted and sentenced to life in prison, he still maintains his innocence. But, he also can't really remember what he was doing on that January afternoon. As Sarah digs into the case, she learns that there's someone who does remember where Adnan was.