In the authorised Miss Marple continuation short story The Open Mind, Elspeth Hearken is a BBC TV producer who is a guest at High Table during the Founder's Day dinner at St Bede's College, Oxford.
Besides being a TV producer, Elspeth had an interest in history. A year or two before the events in the story, she applied to do a PhD on a theory she had about Oliver Cromwell and Lady Sarah Bedlington, one of King Charles II's mistresses. However she got turned down.
During the dinner, Miss Marple and the others at High Table observe the Master Professor Cuthbert Cayling trying to chat her up, even persuading her to change seats and sit with him. She seemed reluctant but gave in since, as Miss Marple observed, she obviously wanted something from him. The Master, on his part, was obviously angling for a TV series for himself. The Master's behaviour became more and more inappropriate and he was observed to be qiving her some of his Quaaludes tranquilizers and was also taking some himself. The events culminated with both of them collapsing at High Table, apparently poisoned. Understanding the what, who and why forms the main challenge for Miss Marple in this story.