Okay, how could I resist that blurb? Roy had me at 'book store" and "late night"; heck she had me at the title as I'm a night owl myself. Throw in vampires, succubi and werewolf-type beings and I was sold. :D There wasn't nearly enough time in the book store but maybe in future books. 
 The werewolf-type beings, known as Jackals or Creeps, are a cross, sort of, between vampires and weres with some zombie thrown in, but are closest to vamps. I actually didn't find them all that creepy but I did like seeing them in their different forms and how they are capable of conning and hypnotizing humans. They were interesting beings promise to be strong foils for future stories. 
 Roy sets up several threads - Val's history as a hunter, her conflict with the nearest group or coven of vampires, Elly's devotion to her foster father and her hunger for a home, Chaz's unrequited feelings for Val and his devotion to her, the war between vampires and Creeps, and the oh-so-interesting secret semi-religious group, the Brotherhood - some of which are resolved in this book and some are left open-ended. I found the beginning of the book to be slow despite starting with a bang. I almost gave up on it a few times but then somewhere around a hundred pages in, I was hooked. I wanted to know more, find out what happened, and spend time with the cast. There's a good-sized with a sort of Scooby Doo gang feel. We get a mix of cliches and originality, some predictable events and some genuine twists. 
 Being a first book, there's a lot of laying the foundation, though as I mentioned, Roy doesn't answer every question. The pacing is slow at first and the head hopping (there are multiple POVs) might be too much for some readers but if you stick with it, the story is worth it. There are secrets galore, lots of action, humor, a hint of romance, and a nice mixing of mythologies. "Night Owls" is a good start to a new series and I'm looking forward to the next book.