Crown of feathers (crown of feathers #1)

I had a sister, once…
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nIn a world ruled by fierce warrior queens, a grand empire was built upon the backs of Phoenix Riders—legendary heroes who soared through the sky on wings of fire—until a war between two sisters ripped it all apart.
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nI promised her the throne would not come between us.
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nSixteen years later, Veronyka is a war orphan who dreams of becoming a Phoenix Rider from the stories of old. After a shocking betrayal from her controlling sister, Veronyka strikes out alone to find the Riders—even if that means disguising herself as a boy to join their ranks.
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nBut it is a fact of life that one must kill or be killed. Rule or be ruled.
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nJust as Veronyka finally feels like she belongs, her sister turns up and reveals a tangled web of lies between them that will change everything. And meanwhile, the new empire has learned of the Riders’ return and intends to destroy them once and for all.
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nSometimes the title of queen is given. Sometimes it must be taken.