A Shadow in the Ember is a 2021 fantasy romance by Jennifer L. Armentrout that serves as a prequel to her From Blood and Ash series, focusing on a princess trained as an assassin to kill the Primal of Death. The novel centers on the Enemies-to-Lovers trope and a retelling of Hades and Persephone, following Seraphena Mierel’s struggle between her duty and her feelings for Nyktos. You can find details and summaries of this novel on SuperSummary and Audible . A Shadow in the Ember by Jennifer L. Armentrout - Audible