"One of us must die for the other to live. But the bond won’t let either of us strike the blow." Lyra is the Obsidian Hand’s finest weapon—a merciless assassin sent to infiltrate the unyielding Obsidian Citadel and take the life of the notorious "Cold Prince," Kael Draven. Her mission is simple: slip into his chambers as a lowly laundry maid, bide her time, and execute the royal bloodline. But the moment she crosses his path, an ancient, forbidden magic awakens. The Sovereign Tether—a legendary, inescapable soulmate bond—locks their fates together. If Lyra bleeds, Kael feels the sting. If Kael’s heart breaks, Lyra suffocates. Bound by an unholy symmetry of pain, desire, and mutual hostility, they are trapped in a lethal game of cat and mouse where every touch triggers a dangerous rush of shared adrenaline, and every lie is laid bare to the soul. Forced into Kael’s private service under the suspicious eyes of the court and his arrogant fiancé, Lyra must maintain her fragile cover. But how do you assassinate a prince when his death means your own? And how do you protect your heart from the one man built to destroy your walls? A high-tension, enemies-to-lovers dark fantasy romance filled with political intrigue, scorching tension, and dangerous secrets.