Nightblood

Ruby has three claims on her future. She loves a powerful Frost King, she is heir to the Fire Throne, and she may be a Nightblood, a child of a vengeful deity who wants to free an imprisoned army of shadowy wraiths.

If the wraiths get loose, they will roam the earth and devour the spirits of people until each one is an empty husk. Ruby can control shadows to a degree and even hosts one inside her own body. That link is fragile and threatens to consume her, and it may not be strong enough to keep the creatures back.

Time is short. Ruby has to bring Frostbloods and Firebloods together to stand against an immortal enemy deadlier than any she has faced. Peace may cost her life.

This is the final book of the Frostblood Saga, a fantasy series for young adult readers. It is a high-stakes, action-driven conclusion in which the fate of Frostbloods, Firebloods and all of humanity hangs on one young woman's choices and her hold on the darkness inside her.