A Lady's Guide to Etiquette and Murder by Dianne Freeman
My rating: 4 of 5 stars

After the death of her husband Frances Wynn, the American-born Countess of Harleighmoves away to town aiming for some independence. With her young daughter, Rose, Frances rents a home in Belgravia and welcomes her sister, Lily, from New York, ready for her first London season.
But her problems start when the police receive an anonymous letter stating that she had killed her husband Reggie. Inspector Delaney starts his investigation.
A really enjoyable well-written mystery, and start to what I hope is a new series. I like that the characters are already so well developed.
A NetGalley Book

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