Raven's Masquerade by Theodore Belcastro

Raven's Masquerade is a romance set against the vibrant backdrop of the 16th Century Renaissance. It follows Lucia Calderone, a capable but reserved Sicilian lady-in-waiting, who finds herself imprisoned in Florence's most feared reformatory: Isola delle Stinche. Her crime? Loving the alluring and promiscuous Anna de' Medici. princess, childhood friend, and niece to the Grand Duke of Tuscany.

In a daring bid for freedom, Lucia devises a plan that'll punish her betrayers and reunite her with the woman she loves.

Sinful liaisons, daring heroics, and intricate plots, rivalling the infamous Pazzi Conspiracy in their audacity and stakes, ensue...