Suzy has a silent watcher. 

But she doesn't it know yet.

Soon she, too, became the silent watcher. 

Watching silently, trying to figure out who it is. 

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*Update-

Previously known as Medicine and a Cure. The description from before was the plot and it's still (kind of) the same. The new description is the description(?).

Love, asdfghjklomg

Picture not mine. Credit to devilgirlmaria.