I promise this is the last Underworld book. Really. This is not a novelization and it was not available for my Kindle so I had to wait for a used book dealer to pull it from their shelf and ship it to me after I purchased it on Amazon. That's why I read all the others a while ago and just read this one.
After writing the novelization for the first movie, Underworld, Cox apparently decided to write his own prequel. This means that what Cox envisioned doesn't necessarily jive with what was later revealed in Rise of the Lycans. It was interesting to see what possibilities he came up with and then know what the original writers, the screen writers, had come up with as well.
Blood Enemy gives a little more back story of a couple of characters in Underworld that weren't ever developed all that much. It was nice to have that and interesting to see a slightly different alternative to the Lucian and Sonja love story.
If you are into the movies and the books, this book is worth reading as well.