You disappear with Will Byers into the Upside down and experience running from the Demogorgan and trying to come back, it shows your relationship with Will grow :)

[Book two of three] It's been almost a year since Will and Marilee were in the upside down, both were affected in different ways, Lee is plagued with nightmares and Will is having PTSD episodes that keep getting worse and worse. But little do they know a terrible evil is lurking near by...

{book one of three} Marilee Hopper lives with her uncle, the chief of Hawkins, Indiana. She moved to Hawkins after her parents died, she now has a job babysitting, mostly babysitting Will Byers while his mom and brother are working. That's what she was doing the night they disappeared, because when they are both run off the road by a monster a whole lot of bad and strange things happen. The next day they wake up in a different world and realize they are trapped. Can she protect him? Will their friends find them? Or will they get separated before they can escape? [Season one] I only own my characters {Jonathan Byers fanfic} (Previously titled "My Fault")