Stranger things (mcsm version)

I'm a fan of stranger things so I decided to make something similar to it. Petra gets abducted in the woods by someone she knew from her past. 3 months later the others go looking for her. When they find Petra they realize she's not the same. She got amnesia and she barely knows any words. Can the others find out what happened and bring the Petra they know and love back?

Jesse is a girl in this story even though on the cover it's a boy.

Cover art not mine btw.