The Orchid Hour by Nancy Bilyeau is a historical mystery set in the 1920s.

After the death of her husband, Zia De Luca lives a quiet life working in the public library and her in-laws store as she raises her son. But when a regular patron is murdered outside the library, Zia is questioned by the police. Shortly after, someone comes into the store to question Zia and then her father-in-law is murdered in his store. A man is arrested but Zia is positive Nettuno is not guilty.

Zia realizes that to find the answers, she will have to investigate herself. Through a connection with her cousin Salvatore, and using her maiden name to hide her identity, she goes to work for an upscale speakeasy called The Orchid Hour. Will she find the murderer of the library patron and her father-in-law before the mobsters find out who she really is?

I really enjoyed this well written historical mystery. My own complaint is that the ending is wrapped up very quickly. But the characters are fascinating and the mystery gives a very good picture of the Italians in New York in the Twenties. Recommended.