Ashworth Hall by Anne Perry

Set in the late 19th century, this gripping historical mystery unfolds as Inspector Thomas Pitt and his wife, Charlotte, are invited to a country estate where a diplomatic conference is taking place. The gathering aims to resolve tensions between England and Ireland, but when a prominent Irish nationalist is found murdered, the stakes rise dramatically. Amidst the opulent backdrop of Ashworth Hall, Pitt must navigate a web of political intrigue, hidden motives, and personal vendettas to uncover the truth, all while maintaining the delicate balance of international relations.