The Devil's Elbow

The Devil's Elbow is a 1951 mystery detective novel by the British writer Gladys Mitchell. It is the twenty fourth in her long-running series featuring the psychoanalyst and amateur detective Mrs Bradley. The novel takes its name from a geographical feature along the route of the trip.

Synopsis
A coach trip around the Scottish Highlands appears uneventful until, near to its end, one of the passengers is murdered. On her own initiative Mrs Bradley sets out to solve the case, where there are no less than thirty one suspects.