Mourn and Shatter (Nine Kingdoms Book 4)

Grief is a weapon. She'll learn to wield it. Seren is dead and Cass wants vengeance. She chooses mercy instead—and walks straight into a trap. Roark will burn through every Fae court to find her, but the truth Cass carries out of captivity may shatter what's left of them. The Nine Kingdoms saga began with a thief who learned to heal. It ends with a healer who learns some things can’t be stolen back.