Astraea Valen is the broken princess of the Noctari Pack. She cannot shift into a wolf, and her own sister wants her dead. On her eighteenth birthday, she is rejected by the most powerful Alpha Prince in the land and thrown out of her home. But the moment she hits rock bottom, a silver light explodes from her skin and connects her to a man she has never met. Cyrus Valdris is a warrior from the enemy Helion Pack. He carries a curse that turns him into a half beast under the sun but leaves him powerless at night. Astraea is his exact opposite. She burns with wolf power under the moon but is weak during the day. Together, they are whole. Apart, they are broken. Now the curse is waking up. The sky is cracking. An ancient enemy who has murdered them in every lifetime is hunting them down. And the only way to break the curse is to reach a hidden altar deep inside enemy territory, speak a vow they spoke a thousand years ago, and spill the blood of the woman who betrayed them. But the woman wearing her sister's face is already one step ahead. And this time, she plans to make sure Astraea and Cyrus never survive long enough to remember.