Destined for an Early Grave by Jeaniene Frost — book slip

Since half-vampire Cat Crawfield and her undead lover Bones met six years ago, they've battled rogue undead and pledged their devotion with a blood bond. Now, as they attempt a vacation in Paris, Cat is haunted by visions of Gregor, a vampire more powerful than Bones with ties to her past. Gregor believes Cat is his and will stop at nothing to claim her. As Cat struggles to break Gregor's hold, she must summon all her power to defeat the most formidable vampire she's ever faced, even if it means risking everything.

Fourth in the Night Huntress series.