This Wicked Fate by Kalynn Bayron

Briseis's mother is dead, but there is one chance to bring her back.

Find the last piece of the deadly Absyrtus Heart. If she is to find the missing piece she must turn to the blood relatives she's never known, learn of their secret powers and take her place in their ancient lineage.

But Briseis is not the only one who wants the Heart, and her enemies will try to use her in any way they can ...