untold mystery

a secret society and a hidden libraries.
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?: you are the key
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officer : hello everyone this is to inform you that in our area there is a psycho serial killer so please do not stay out of house at night specially girls. and may note close your windows and doors .thank you
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everyone in the college where afraid of psycho killer.
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everyone please pay attention he is our new maths professor.
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the professor look at y/n with a smirk but she doesn't notice it.
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[ hi this is my first story it is thriller ,mysterious it has murders ,rape, sexual abused and language so please read it in your own risk. and please forgive my grammatical mistake because English is not my first language and please don't copy my story.]

where is secret society and hidden library what dark past y/n have .what will happen when y/n will meet psycho killer and what happened in y/n past what if the psycho killer also have a dark past why he is killing the people.

[ this you will come to know when you will read the story.]
thank you.