As a Reincarnated Aristocrat, I'll Use My Appraisal Skill to Rise in the World, Volume 5

As the new baron of Lamberg, Ars vow to honor his late father’s wishes by siding with Prince Couran in the Summerforthian war of succession, even as the nearby county of Plena backs Couran’s younger brother, Prince Vasmarque. When Ars’ spy intercepts a letter showing that one of Lamberg’s allies is colluding with Plena, House Louvent’s plans are thrown into disarray. But could there be more to this letter than meets the eye?