Diamonds of Ice (Department 57, #11)

Sorcerer Fabrice Germain lost his Talent when he was assaulted, but he still has his job. Relocating to London seems like the answer, and then he meets Gemma, who works for his rival. She’s a vampire. That’s two reasons to avoid her, but Fabrice and Gemma still end up scorching the sheets one Saturday night.
Then the world goes to hell. Fabrice ends a weekend of passion and tragedy as a converted Talent - a vampire now, like Gemma. One who has sworn to avenge two murders, and is back as an a...