Hawkins was small enough that everyone knew everyone. And when you were little, that meant you knew Mike Wheeler better than anyone. You grew up in basements and bike rides, in promises whispered too quietly to last. You were part of the Party before Hawkins broke - before monsters, secrets, and a girl with powers changed everything. Then you left. Years later, you come back to a town that remembers you... and a boy who doesn't know how to talk to you anymore. Mike Wheeler has changed. So have you. And somewhere between unfinished letters and unspoken feelings, there's something neither of you ever truly let go of.