Bess Carstairs was the mother of Jake and Vienna Carstairs. She was the wife of Brian Carstairs, with whom she co-owned a hotel. She was invited to the Chelsea 426 flower show. Her children and she went, but her husband could not go. Instead the Tenth Doctor, who was a guest at their hotel, went with her. At the show she, among many other people, was infected with the Rutan virus and forced to fight when the Sontarans invaded Chelsea 426. She survived and freed when the Doctor released oxygen in the air, killing the Rutan Virus. After she was cured she could not remember anything from when the virus controlled her. (PROSE: The Taking of Chelsea 426)
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