Misjudged (Harry Potter)

This is not a student × teacher story where the two form crushes for each other and then find out their 'in love'. I really don't like that.

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Your a girl (12)
You can decide your look

Alright, picture this:

You have been living with your mother your whole life. Only for it to change in one night. When your mother is brutally murdered in your house you emotionally break
You would do anything to seek revenge on the person who committed this horrid crime. So far that you would actually become a Death Eater for you know who. He promises that he would help you find the murderer of your mother on one condition : You need to go to Hogwarts and become an inside spy.
Along with that journey you uncover one of the biggest secrets that's fatal to your plan.

Join (y/n) (l/n) in this adventurous, dark, unexpected, twisted journey.

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This story may contain some abuse. (It's really not a lot or that bad!)
All recognizable characters /items etc belongs to J.K Rowling.
Of course the plot was thought out by me.