Like many others drawn to sci-fi/horror novels. I picked up this book after the recommendation of many on this site who compared it to the Anita Blake series. This series is definitely up there. It is a total of 5 books, and this is the first in the series.
Vicki is an ex cop turned private investigator who had to leave the police force because she is losing her night vision. One night at the subway station Vicki finds a murdered body, and even though she has left the force, she feels compelled to investigate this crime (and it helps that she is finally hired to investigate the crime). While investigating she meets Henry, a romance writer who is also a vampire. Henry has his own reasons to investigate the crime. Vicki is unable to see at night. Henry is unable to go out during the day. They both have to work together to discover the murderer.
I do not want to give too much away, but if you are looking for a good vampire series, give this one a try. You will not be disappointed. If you would like the exact order of the series, it is Blood Price, Blood Trail, Blood Lines, Blood Pact and Blood Debt. This book and the entire series gets five stars!