Mary Summersby
From Tardis Wiki, the free Doctor Who reference
Mary Summersby was attending one of Oliver Mortlake's parties in 1907. She was interested in the screaming glasses. She told the Fourth Doctor about the castle archives. She wanted to help the Doctor in his research. She owned the castle.
She was the great-granddaughter of the magic lanternist Mannering Caversham. (AUDIO: The Darkness of Glass)
