In this historical mystery, Lady Kiera Darby finds herself embroiled in a chilling investigation during a New Year's Eve celebration at a Scottish castle. When a body is discovered in a hidden passage, Kiera and her husband, Sebastian Gage, must unravel a web of secrets and deceit among the guests. As they delve deeper into the case, they uncover motives rooted in jealousy, ambition, and revenge, all while navigating the complex social dynamics of the aristocracy. The couple's sleuthing skills and partnership are put to the test as they race against time to identify the murderer before more lives are endangered.