Grace is the sister of Frank Vodyannoy's butler. She was lost for several years in Mr. Vodyannoy's house, Nightshakes, before she was found by John Gaunt in the east wing of the house. However, she seems to be seeing things as she mistakes a jaguar for a sheep. John brings her back, where she is reunited with her brother.
She had long unkempt dirty hair, and a strange smile on a face that was almost all skin and bone. This appearance was presumably from her longtime impoverishment in the east wing.