Eona by Alison Goodman

The Last Dragoneye

A young woman who has long hidden her sex to train as a Dragoneye must confront the deadly legacy of the Dragon spirits and the poisonous intrigues of the imperial court once she assumes her role as the realm’s last Dragoneye. As she struggles to master the dragons’ dangerous power, she faces betrayal, political maneuvering and a growing supernatural threat tied to an ancient, malevolent dragon, forcing her to risk everything to protect the nation and to reconcile her identity, duty and the cost of sacrifice.

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