Heartless Hunter, tome 3 : The Dark Descent

Rune Winters died for Cascadia and came back changed. The resurrection left something dark coiled beneath her ribs: a growing corruption she can’t explain and can’t afford to reveal. Not to the political enemies demanding evaluations for all witches, and not to Gideon, the former witch hunter she married who she fears losing most of all. As witches vanish across the country and a foreign empire arrives with an offer of protection they're too desperate to refuse, Rune is forced into increasingly dangerous choices between the woman she wants to be and the power she was born to wield.