As Happy As the World Allows

For five years, Hermione has sat in a cell of Azkaban, cut off from the outside world and filled with despair. She has to be one of only a few Muggleborns alive, her friends and family all dead under Voldemort's reign. Dementors hover, and she listens to the drip of the water all day long. Then one day, someone is put in the cell next to her. Voldemort wins!au. Dystopian!au.