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"Is this─?"
"The gilded vow."
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Lucien Mathis de Valentine has spent years searching for his childhood friend, bound by a promise to always stay together. Raised in comfort, free from responsibility, Lucien's life changes when he's drawn into a world of unearthly secrets-and a dangerous cult seeking the power in his blood.
With unexpected allies and the friend, he thought he'd lost, Lucien is pulled into a fight against forces beyond his control. As the line between worlds blurs, one question remains: How far will he go to keep the vow made in youth─and what is he willing to sacrifice for the truth?