In the novel The Moving Finger, Beatrice Baker had used to work at Little Furze, the house of Emily Barton. When she received an anonymous letter, stating that she had an affair with Jerry Burton, she left her job. Beatrice's boyfriend George was jealous when he heared about the letter. Even though these rumours weren't true she still felt that she couldn't work at Little Furze anymore. But then her boyfriend gots another anonymous letter, claiming that Beatrice was having an affair with another man. Her mother asked Jerry for help.
In the BBC 1985 adaptation of the novel which formed part of the Miss Marple series, Beatrice was played by Juliet Waley. Her surname is given as "Dunn" which is not used in the original novel. In the adaptation, just as in the original novel, her boyfriend George receives an anonymous letter about her. However she also takes over the played by Agnes Woddell who does not feature in the show. Here, Beatrice quits her job at "Little Furze" after the anonymous letter to George. She then takes on a job with the Symmingtons. She has a quarrel with George and then goes home early and was in the whole day when Mrs Symmington was believed to have committed suicide. She thought there was something odd about the circumstances of the death of her mistress. She called Partridge wanting to speak to her but was murdered before she could do so.
Beatrice is not featured in the ITV 2006 adaptation of the novel (Episode 2, Series of Agatha Christie's Marple).