Marrow Blade (The Crest of Blackthorn Book 3)

She's destined to die choking on her own blood. Her only hope is the cruel boy who killed her grandfather. Caia Blackthorn is the key to ending the reign of a power-mad king. A king who compels his own people to light themselves aflame. A king who will use her to create an army of necromancers if she fails. The only price is her life. Her one hope of surviving this grisly fate is the king's pet assassin. The only problem: he was tortured by Caia's sister and detests family Blackthorn. Two things threaten to unravel everything: a dark truth buried deep in his past--and an unwanted, forbidden attraction.