High school juniors and best friends Blair and Cameron start a true crime podcast to investigate an unsolved murder in their hometown, and after making a startling discovery, they accuse a potentially innocent man of murder on one of their episodes.

Despite their resolution to avoid mysteries and podcasts, Cam and Blair re-enter investigative mode when Mattie Brosillard seeks their help, convinced that someone is impersonating her sister Lola, who disappeared five years ago. "In the months after Cam and Blair broke their small hometown’s legendary missing-girl story and catapulted to accidental fame, they vowed never to do it again. No more mysteries, no more podcasts, and no more sticking...