Seven Dials by Anne Perry

Set in the vibrant yet perilous streets of Victorian London, this gripping mystery follows the astute detective Thomas Pitt as he delves into the enigmatic world of espionage and political intrigue. When a high-ranking diplomat is found dead under suspicious circumstances, Pitt must navigate a web of secrets and lies, uncovering connections that lead him to the shadowy underbelly of society. As he races against time to prevent a potential international crisis, Pitt's relentless pursuit of truth reveals the dark complexities of human nature and the lengths to which individuals will go to protect their interests.