An Infamous Betrayal by Lynn Messina

Two murders. Unassuming spinster Beatrice Hyde-Clare has now solved two murders. Both brought her into proximity with the Duke of Kesgreave for whom she is starting to develop a tendre. Which is ridiculous. He is in the upper echelon of peers and she is an orphan with a family that is acceptable at best. So when a person familiar with her problem solving on her first murder comes to her and asks for help with a second, Beatrice jumps at the chance. 

It seems the mother of the man's fiancee had a lover. That came out during the course of the first investigation. Now the man is dead, having expired in the mother's bed. Unfortunately, the duke seems determined to help her solve the mystery, even going with her when she once again dresses like a man. 

The mystery is definitely unfairly clued but the overarching storyline of the series moves quite nicely in this book and there are plotlines for subsequent books that are seeded here. 

Three Stars

Follows A Scandalous Deception 

Followed by A Nefarious Engagement

This book came out August 12th, 2018

Borrowed as ebook from Kindle Unlimited

Opinions are my own