Dishing the Dirt — Gavin MacDonald

When six professors are drugged at a dinner and then humiliated by being smeared with unpleasant substances, Sergeant MacRae is baffled, but Chief Inspector Forsyth forsees a related incident which turns out to be the murder of a lecturer notorious for seducing local wives and female undergraduates. When a campus wife, who was having an affair with the lecturer, is also murdered on a lonely beach at the time that her husband is holding a departmental party, everyone is at sea except Forsyth who comes up with a solution to all the incidents by the application of some brilliant logical deductions.