As I mentioned before, I found this series because there was a shapeshifter mentioned in the Bitten By Books shapeshifter poll, Daniel Frey. He's not really a major character, but he does play a part in the 2nd through 4th books.
I enjoyed this series, but found myself easily frustrated while reading it. Anna is a new vampire, created by accident. My frustration lies in the fact that she does not accept the guidance offered to her by other vampires. The police chief is a vampire who is trying to help her and she pushes him away at every turn. For some reason, she keeps trying to find her own answers but I feel like she's looking in the wrong places (She keeps going to shapeshifters for answers. Why wouldn't she ask vampires?!) The books mix a lot of human bad guys (her boyfriend, Max, is an undercover DEA agent and she deals with all that is associated with that) with supernatural bad buys (vampires and witches and werewolves, oh my!) and Anna certainly has her hands full trying to juggle them all. The 2nd book, Blood Drive, was my favorite; Anna discoveres she has a niece, who has gotten unwillingly mixed in with a child porn ring. The 3rd book, The Watcher, involves a homicidal stalker-type and a witch. Max discoveres that she's a vampire. The 4th book, Legacy, involves a murder and werewolves. Max is not speaking to Anna, and she discoveres him with another female vampire. I'm really pulling for her relationship with Max, although it doesn't look good. Her relationship with her partner (they're bounty hunters) is also very hot/cold. Not sure where that's going either.
So, I enjoyed the series, but will not be keeping the books. I will read the next installment in the series.