Sacred Blood

Battered and frightened, Juliette St. Claire flees from near-death at the crushing hands of her boyfriend, to find her closest friend, Tristan Larocque, only to discover he has kept a vital secret about his identity.
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Juliette lives her existence resigned to her boyfriend, Nathaniel Jensen's violent whims. After a particularly violent evening, she has had enough, and a high window is her only chance at escaping with her life. Desperate to live through the night, she flees.
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Finally free, Juliette finds her best friend, but just when she needs him the most, Tristan must leave. She learns that he is a upiór who needs to find and warn a lost coven of his kind that they are in danger from Nathaniel, an instinctively violent skin-walker determined to abolish them. Rather than hide from the danger her ex presents, Juliette, determined to keep Tristan safe, insists that she accompany him on his mission.
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Over the course of a multi-country journey to save the mysterious coven, Juliette discovers she has more internal strength and courage than she'd ever realized. She leads the coven into battle against the skin-walkers and discovers she alone holds the power to destroy her terrible ex-boyfriend, or to mercifully spare his life.