Dark Hermione

Who would ever know that Hermione, the perfect and top of class student of Hogwarts and "muggle-born" turns out to be something entirely different.

It takes one day. One morning. One dwarf. A key. A letter. And a man. All to turn her world upside down. Will she be able to return to the good side after entering the dark side? Or will she be trapped forever and forced to marry someone she hated since year one at Hogwarts?
Maybe she will be able to stop a war that will soon envelope the world of magic...