Ghost in the Garden by Mary Lancaster

Partners in crime… but not in love?

Silver & Grey take on their first official inquiry, when Mrs. Angela Lambert hires Constance and Solomon to discover the truth about the ghost haunting her garden.
Constance enters the household disguised as Angela’s maid, but the apparently trivial case turns serious with the discovery of Caleb Lambert’s underworld connections, and his involvement in the fatal collapse of a slum dwelling. Bringing him to justice becomes more important than the mystery of the ghost – or is the ghost somehow involved?
A murdered body in the cellar further complicates matters, as does a threat to Constance’s colorful mother.
Alone in a houseful of dangerous murder suspects, with only Angela’s doubtful protection, Constance’s feelings for Solomon begin to clarify – as does the true impossibility of a personal relationship between them.