Evelyn was fathered by a werewolf, but adopted as a baby to human parents and never knew anything about her own kind. She had struggled her entire life with a steady decrease in the use of her limbs from a rare genetic disorder. The Doctor had tried to treat her condition, but it seemed to get worse over the years, until she met someone who changed everything. His connection with her was unlike anything she had ever hoped to have, and through that bond she discovered who she really was, and who was responsible for keeping the truth from her.