D Erskine Muir Book order (chronological)

Charles Courtney is shot in the woods and the police find that everyone had reason to bear a grudge against him. His secretary is charged but the trial ends in acquittal and the case looks to remain unsolved, but then a second death occurs.

Elderly Simon Ewing is found murdered in his flat, it is assumed to be a robbery gone wrong. But he was left unattended only a few minutes so how did an outsider know when to strike? And why take only one ring from a treasure trove? A fictional whodunnit based on a real murder case.