Sarah Castle was the young daughter of Mrs. Castle, the housekeeper at the stately mansion of Collinwood in Collinsport, Maine.

Sarah Castle became very close to Angelique Collins, a witch and lover to Collinwood's patriarch, Charles Collins. Angelique once gave Sarah a keepsake and told her that so long as she held onto it, she would always remember her.

Later Sarah witnessed Angelique being executed for witchcraft on the grounds outside.