D.V.Bishop: The Darkest Sin, 978152903842, Pan Macmillian, paperback 

Right after reading "City of Vengeance" I downloaded the ebook for the follow up, The Darkest Sin", which won the CWA Historical Dagger for 2023, featuring the wonderful Cesare Aldo, officer of the Otto, set in Renaissance Florence.

 Just as rich in atmosphere as the first book, Aldo gets entangled in solving a murder inside a convent. A naked man, stabbed multiple times, was discovered by a nun in the morning prompting an investigation by the Church  and Albo,  representing the city. He strongly contradicts the church officials conclusions and using a trick,  sets off on a path of investigating each nun as he firmly believes that one of the nuns is quilty of murder.  How the man got into the convent is another mystery.

Brilliant plot,  atmospheric and transporting you into the political mine field of Florence in the 16th century, I loved The Darkest Sin, almost as much as City of Vengeance.