Carpe Diem Mortis

It's 300 years after demons and Lucifer himself has quite literally sprung free from the depths from hell and taken reign on earth. Demons and Lucifer himself have created a new world, the demolished everything from the old world to preserve their true place as king over people. They determine when you live and you die.
The story takes you into the world of Liezbet Moore. She looses everything that has ever truly mattered to her in her life. Caught by a sudden moment of weakness right after the loss of her mother she has her soul taken from her. In another off chance by the fates she is randomly selected to be the next assistant to Lucifer himself.
Does Liezbet have it in her to stay strong and save her self, and possibly the whole human race, or will she become another name on the long list of the defeated?
We both know if you have gotten this far she is going to win but hey why not try a question we know the answer to?