"Shadows"

An undiscovered species has somehow found contact with a young human.
Anastasia, who had been living under shadows for her past life receives a letter of warning.
She is the only person informed of this matter and the only person who can solve this puzzle and save millions of lives. Is this true?
But will the secrets of her past demolish the chances of success? Will she let her emotions get the better of her? Or could it risk her life?

(Incomplete. Updating daily)