Seth and Hannah Baker investigate a strange audio file sent by a mother who is looking for her missing daughter, Marissa. As they listen to the audio file, they discover the grim truth about Marissa and why she went missing. Hannah decides to do some research and uncovers that Marissa had killed her friend in a drunk driving crash. The context of the crash becomes even more disturbing when Hannah discovers that the entire incident had been live streamed on Marissa's Instagram account. Seth and Hannah proceed to listen to the final minutes of the audio file that reveal that Marissa has been captured and perhaps killed by a strange paranormal force. They decide to split ways, only to realize that Marissa has followed them both.