Eternal Flames by Stacy Reid — book slip

Tehdra El Kyn, a warrior elite from the shadow realm, infiltrates the Nurian kingdom as a concubine to the merciless King Ajali, whom her demon has claimed as mate.

Amidst a court rife with deceit, political intrigue, and danger, she strives to prevent the king's assassination without betraying her heart or her realm. Facing terrifying choices, Tehdra risks death or war for her kingdom.

King Ajali Haddin, powerful and ruthless in protecting his loved ones, uses Tehdra, a suspected spy, to draw the enemy into combat.

Unexpectedly captivated by her fierceness and beauty, resisting her becomes his hardest battle, as claiming her could mean betraying his kingdom.