Despite the somewhat generic name, Enemy Lover turned out to be a fast-paced, well-written, exciting read. I'd suggest that the next cover title have a little more oomph, because I couldn't help but wonder how many people will just gloss over that name because it doesn't grab enough attention right away.
Jax's characterization was one of the high points of this story. I really appreciated how she was strong, smart, and yet still had definite foibles that affected her negatively over the course of the story. Harlow doesn't pull any punches with Jax's mental condition, and I like that. I thought that possibly Jax could have had a few more episodes than she had, but it's frequent enough that it's clear she didn't just wake up one morning and decide to get over her PTSD.
I thought that the entire vampire line was a bit under-defined, however. I would have loved to have had more information regarding Rurik, Aelia, and Lazarus. It wasn't bad enough to be irritating or to significantly detract from the book, but I thought that if there had been a bit more background on what exactly the vampires wanted, how they interacted with the human world, the hinted-at supernatural world and their involvement in human affairs and so on...
Enemy Lover does end on a pretty good note. True love conquers all -- for the moment. I'm anticipating the next book in the series and I hope to see Harlow flesh this world out more.