Will goes missing

Maddison (Mason in season 4) Wheeler is in a club with her twin brother Mike and her best friend, Will Byers. Will ends up going missing and the gang goes to find him but find this girl. Maddie has a crush on this new girl but doesn't know how to express it.
All rights to the Duffers, Characters do not belong to me.
Max joins El and Maddie(Mason)'s relationship in season 4.