A Vow So Bold and Deadly - Epic Fantasy Adventure Novel | Perfect for Book Clubs & YA Fantasy Lovers" （注：根据您提供的原始标题"A Vow So Bold and Deadly"，这似乎是一本奇幻/青少年小说的书名。优化后的标题： 1. 保留了核心书名作为主要关键词 2. 添加了书籍类型说明（Epic Fantasy Adventure Novel） 3. 增加了使用场景（Book Clubs & YA Fantasy Lovers） 4. 符合SEO规范，包含相关搜索词 5. 全部使用英文）

KINGDOMS WILL CLASH. CHOOSE YOUR SIDE.Grey has been revealed as the rightful prince of Emberfall. But the kingdom is crumbling fast, torn between his claim and that of the reigning Prince Rhen and Princess Harper. Newly crowned as Queen of the enemy kingdom Syhl Shallow, Lia Mara struggles to rule with a gentler hand than her mother. But as Grey moves closer to claiming the crown of Emberfall, both Harper and Lia Mara are forced to question where they stand and how far they can follow the dictates of their hearts. Brigid Kemmerer's heart-pounding saga comes to a thrilling climax, as two kingdoms come closer and closer to conflict and an old enemy resurfaces who could destroy them all.Hungry for more fantasy romance? Don't miss Brigid Kemmerer's next heart-stopping series, Defy the Night, coming autumn 2021.