Set in-between Seasons 3 and 4 Nancy Wheeler can handle homework, government conspiracies and monsters from other dimensions trying to end the world but two things she can't handle: finding out her mother almost cheated on their father and relationship advice from her younger brother Mike.

Happily married Mike and El Wheeler are invited to attend a school reunion back in Hawkins with the rest of the Party. Unfortunately their past comes back to haunt them as one by one they are attacked by a new villain who wants revenge. Together the group must band together and discover the mystery of their attacker before they strike again. Set in 2005