Scotland 1832. After enjoying a delightful holiday with her family, Lady Kiera Darby is looking forward to finishing her new friend, the Duchess of Bowmont's portrait, as well as attending the duchess's annual Twelfth Night party. Though she normally avoids such fashionable events, Kiera trusts the attention will not be focused on her, but rather her notorious hostess and her family. But upon their arrival at the opulent Scottish estate, Kiera and her husband and fellow investigative partner, Sebastian Gage, swiftly deduce that all is not merry in the duke's household. The family appears to be under a great strain, and someone seems determined to cause mayhem among the guests with a series of forged notes.
However, matters swiftly turn from irksome to downright deadly when the merrymakers stumble upon a decomposing body in the castle's crypt. This corpse is certainly no laughing matter, especially when it is identified as the duchess's son-in-law, the Earl of Helmsdale, who had purportedly traveled to Paris more than a month earlier. It is evident the man met with foul play, and Kiera and Gage step in to investigate, at the duchess's insistence. Kiera and Gage must swiftly reexamine the facts, for a ruthless murderer walks among them and may well be a member of the duchess's own family. Kiera soon discovers just how deep the killer is willing to dig to keep their secrets from ever seeing the light of day.