Verity Browne and Lord Edward Corinth are attending a memorial in Westminster when the service is interrupted by a young woman's desperate cry for help. Too late, they find Maude Pitt-Messanger's father slumped in his seat, stabbed to death with an ancient Assyrian dagger.

Verity travels to Swifts Hill, Sir Simon Castlewood's Kent estate, to investigate the murder, where she begins to discover more about Maud's father: the old man was selfish and cruel, and had prevented Maude from marrying the man she loved, making his daughter's life miserable.

Edward and Verity must join forces to unmask the killer. However, Verity's growing attraction to young German aristocrat Adam von Trott drives a wedge between the two friends – but will it ultimately end up endangering the outcome of their investigation?

Trope: Amateur detective, Detectives, Whodunnit