Petherbridge was a university researcher. She mistook Peri Brown for Sarah Perry, her favourite writer. She told Peri and the Sixth Doctor about the poison pen letters to Ruth Horwitz. She didn't want the police to look into the matter. She was the principle of the college. (AUDIO: An Eye For Murder)
Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.