A high-school senior named Hae Min Lee disappeared one day after school in 1999, in Baltimore County, Maryland. A month later, her body was found in a city park. She'd been strangled. Her 17-year-old ex-boyfriend, Adnan Syed, was arrested for the crime, and within a year, he was sentenced to life in prison. The case against him was largely based on the story of one witness, Adnan’s friend Jay, who testified that he helped Adnan bury Hae's body. But Adnan has always maintained he had nothing to do with Hae’s death. Some people believe he’s telling the truth. Many others don’t.

Sarah Koenig sorted through thousands of documents, listened to trial testimony and police interrogations, and talked to everyone she could find who remembered what happened between Adnan Syed and Hae Min Lee. She discovered that the trial covered up a far more complicated story than the jury – or the public – ever got to hear. The high school scene, the shifting statements to police, the prejudices, the sketchy alibis, the scant forensic evidence — all of it leads back to the most basic questions: How can you know a person’s character? How can you tell what they’re capable of? In Season One of Serial, she looks for answers.