Root of All Evil - E. X. Ferrars - Bog

If Andrew Basnett were a savvy mystery reader rather than a retired professor of botany, he would know that an invitation to spend Easter weekend at the Berkshire estate of a wealthy distant relative always involves at least one murder. This one delivers a death threat, an imminent disinheritance, a theft, and two corpses--good thing the quiet professor is around to suss out the family's secrets.