A Vow of Shadow and Blood

In the Kingdom of Kalyn, humans are good for two things. Hunting and owning.

Adina Barron was bred to serve the ruling-class vampires. Owned from birth by Blackwood House, her only desire has been to keep herself and her sister safe. But Adina harbors a dark secret. She possesses the power to turn her blood into a deadly poison that kills vampires. An ability she swore never to use until she learned that her sister was dying. After discovering that vampire venom can extend life, Adina has spent the last year risking exposure and execution to hunt and kill the creatures...

In the Kingdom of Kalyn, humans are good for two things. Hunting and owning.

Adina Barron was bred to serve the ruling-class vampires. Owned from birth by Blackwood House, her only desire has been to keep herself and her sister safe. But Adina harbors a dark secret. She possesses the power to turn her blood into a deadly poison that kills vampires. An ability she swore never to use until she learned that her sister was dying. After discovering that vampire venom can extend life, Adina has spent the last year risking exposure and execution to hunt and kill the creatures she was born to obey. But desperation leads to foolish mistakes, and when she accidentally reveals her power to a mysterious stranger, she is forced to make a difficult choice. Use her ability to assassinate the Crown Prince or watch her sister die. The decision is easy, and it’s not long before Adina manages to use her wits and cunning to embed herself into the prince’s life. But making the kill is not as simple as she anticipates, especially when fate seems hell-bent on drawing the pair together. And when whispers of a war start to arise, Adina realizes that there may be bigger issues than just saving her sister.

But time is closing in, and soon she will be forced to make a choice. Her sister? Her kingdom? Or her heart? Because one thing is clear, she cannot save them all.