Death in an ivory tower

Dotsy's at a scholarly conference at Oxford; the subject is The Lingering Effects of the King Arthur Tales on Life in Elizabethan England. But two participants don't fit in: Dotsy has inadvertently invited a couple of New Agers from Glastonbury. Their agenda is to prove to these arrogant academics that King Arthur and Guinevere were real people. As a big surprise, Bram Fitzwaring plans to produce their royal bones. When he turns up dead, Fitzwaring-- an insulin-dependent diabetic-- appears to have died from hypoglycemia. But Dotsy, also diabetic, says his symptoms prior to his demise do not spell hypoglycemia. They spell murder.