Master of Valor (Merlin's Legacy #2)

Handsome Afghan war veteran Duncan Carpenter barely survived a horrifying IED attack that cost him his legs. He gets a second chance at life when he agrees to become an agent of the Magekind -- a vampire sworn to protect humanity. The spell that transforms him also heals his broken body and gives him incredible new abilities. Now he must pay for that gift, because the Magekind is preparing for war with powerful magical enemies. But first he must complete his training with a Magekind witch, Masara Okeye. Problem. He’s falling for his mentor, even as he struggles to deal with life as a vampire.

Masara finds her apprentice deliciously seductive -- a little bit too much so for her peace of mind, because he brings up memories better left buried. But when Duncan and Masara are asked to help a werewolf cop investigate the murder of a jogger, they’re targeted by the same vicious killers. The fight for survival drives the couple together, despite Masara’s determination to keep her distance. Then the case turns even more horrific and mysterious. What turned a couple of loving werewolf grandparents into vicious killers?

And what’s with the flying rabid zombie rats?