A Shadow in the Ember by Jennifer Armentrout

The story centers around Seraphena "Sera" Mierel, a maiden believed to be destined as the Primal of Death's consort, but secretly a trained assassin tasked with ending him.

This book contains; alcohol, assassination, child abuse, death, gore, lying, potentially patently offensive content, potentially prurient content, profanity, obscene sexual activities, self-harm, sexual assault, sexual nudity, sex trafficking, smoking, suicide, torture and violence.