A rumor from a high school prom in 1989 sparked an investigation in 2004 when federal agents looked into a murder case where the suspect was known, but the victim was unknown. Pulitzer Prize-winning journalist Jake Halpern narrates the story in Deep Cover, unraveling the investigation and the family's quest for answers. The plot unfolds in a Philadelphia courtroom where themes of murder, memory, and morality are put on trial. The journalist shares his unique interviewing technique, the 'Hail Mary of Questions,' to uncover missed details, adding intrigue to the storytelling.