Dandy Gilver is asked to look into Lena Duffy's claims that her diamonds were stolen at an Armistice Ball. The diamonds were insured through a company owned by Silas - the husband of Dandy's friend Daisy but the premiums had lapsed. Lena is trying to blackmail Daisy and Silas into paying up for the diamonds.
What follows is a well plotted and complex mystery in which Dandy frequently finds herself out of her depth and floundering. She has the assistance of Alex Osbourne who is engaged to Cara, one of Lena's daughters and they make a very good pair of sleuths.
I liked Dandy as a character and it makes a change to find a married female sleuth whose husband plays very little part in the story. He is useful to invite make guests to stay where Dandy herself cannot invite them because of etiquette but he plays no part in the investigation apart from this. This is the first book in the series.