Duke of Christmas by Ellie St. Clair

Descent into darkness…
Six years after his betrothed was murdered in the foyer of his London home, Daniel Harrington, the Marquess of Ravenhall, is consumed by rage and a thirst for justice. He spends his days searching for the man who killed his love and works tirelessly to right the injustices of others. Nothing, however, seems to heal the hole left in his heart. Though he vows to never love another, his father, the Duke of Ware, has other ideas. Tired of his son’s disregard for his birthright, the duke arranges for his son to be married to Lady Christina Princeton.
Longing for love…
Christina Princeton has longed for a Season to choose for herself the perfect companion with whom to share a life. Convinced by her father that she is too plain, too plump, and too practical, she wishes for a man who can see her for the woman she is inside. Dismayed when her father reveals his plans for her marriage, she considers the option until she finds the man she is to marry is the very same she witnessed carrying out an act of shocking violence.
Despite the wall Daniel has built around his heart, Christina slowly begins to pry through the cracks, searching for the kind, caring man of whom she has seen but glimpses. With the past haunting them and new dangers emerging, they must help one another fight all that threatens them. Will they be lost to the darkness forever, or will new love overcome all odds?