“His blind and aged father and his gentle sister lay in a noisome dungeon while he enjoyed the free air and the society of her whom he loved. This idea was torture to him.”
– Mary Shelley
Frankenstein, Chapter 14. The monster tells the story of how Felix feels guilty about his family being arrested for something he did, so he turns himself in. Felix had aided Safie’s father in a plot to subvert the biased French justice system and free the Turkish merchant from death on the gallows.