Prince by Day, Reaper by Night

Seraphina North, an orphan, is forced to become a substitute bride for her stepsister, marrying the Sixth Prince, Kaelan Julian, frail and chronically ill. He is secretly the Pavilion Master of The Nether Pavilion, seeking revenge for a blood feud. The two join forces, tearing through court conspiracies, overthrowing the treacherous Crown Prince, and solving a bloody case. After enduring border wars and palace intrigue, they rule the realm side by side and protect its peace.