1 year after Hannah Baker's suicide, there's a new girl in town. She's mysterious and doesn't know a lot of people. But she knows more than everyone thinks. Meet Mackenzie Baker, the younger sister of Hannah Baker. She's only younger by a year but after not hearing from Hannah for a while, she decided to return home from boarding school, only to find out her sister had committed suicide. Famioy friend Tony told her everything he could, sending her the tapes to fill in the details he couldn't bring himself to tell her. Now that Mackenzie knows everything, can she forgive the people that drove her sister to suicide? Or will she decide that they deserve the same fatal end that her sister believed was her only escape?