Can anyone suggest the name of a female author and the title of her novel that is a whodunnit in a university setting? The characters are mostly university students, two of them siblings, who are led by a professor in solving a mystery of some sort. I read the novel in 1992 or 1993, and I cannot find any clues to jog my memory. The format was mass market paperback. For a while, I thought Patricia Cornwell might have been the author, but I can't find anything remotely similar by her.
Thank you!