Fire Song by Tanya Anne Crosby

Praised for her beauty and grace, deep down, Seren Pendragon fears a tempest rising inside her. Her mother is a witch, her sisters are in peril, and she has been promised to a beast of a man who’s already murdered one king. When she and her youngest sister seize the opportunity for escape neither realizes how much their struggle will cost, and it will take a terrible tragedy to unleash Seren’s inner fire and true nature.

The Bastard of Warkworth is no stranger to misfortune. Everything he held dear vanished one night in a wisp of smoke and fire, and he has been scarred by his encounters with Seren’s own mother, Morwen Pendragon. Even so, when one of the witch’s daughters finds herself in trouble, Wilhelm must find the champion within and ride to her rescue.