Duchess in the Attic: Volume 4

Now blessed with her beloved son, Ludrick, who just turned one, the duchess Opal Holloway decides to finally relax a little from her work; nothing is more important to her in the world than her dear son and husband. Unfortunately, poor Opal can’t catch a break! While in the attic of her new home she receives a summons from none other than King Alessandro. The king asks Opal to become chaperone and tutor to his niece, the immature and selfish heiress Princess Ellie of Lumeon. Though she refuses at first, once she sees Ellie for herself, the duchess eventually agrees. Little does she know that doing so will throw her headfirst into a conspiracy that involves serial murders, scammers, and a powerful group looming over Lumeon itself...

[From J-Novel Club]