
Claire, a heiress of a prestigious family, must secure her hundred-billion-dollar trust inheritance at twenty-one. By day, she plays the demure, rule-abiding "saint," enduring the provocations of her stepbrother Cole and others. By night, she is the dominatrix of an underground club. Kilian, a prince of the deep-sea royal clan, comes ashore to retrieve the sacred relic "Heart of the Abyss" plundered by the three great families. He stumbles upon a stunning discovery: Claire can quell the berserk frenzy of his bloodline. Disguising himself as a transfer student, he draws close to her. The two strike a pact. Claire wields Kilian's power to sweep away her obstacles, while Kilian uses her identity to trace the lost relic. Amid their games of wits and quiet entanglement, feelings begin to bloom. As the layers of conspiracy peel away, Claire learns that Dorian, head of the Blackwood family, means to claim her as his prized possession — and that her mother's death is tied to him as well. Through peril after peril, the two join forces to bring down their enemies. Claire inherits the vast fortune, abolishes her family's unjust old laws, and rises as a formidable female tycoon. Kilian settles the affairs of the deep-sea clan and returns — and at the cliffside manor, the once-ferocious deep-sea sovereign kneels before her. Thus the story draws to a close.