Admittedly, I dove in here, so these can clearly be read as a standalone. That being said, there are some overlapping characters that would help in knowing, or at least make you happy to "check in" with them.
Liese is a geeky girl, making her own way while supporting her mother and recovering from an epically bad relationship. She's shocked to discover that history can indeed repeat itself when the blood bank she works for hired an automation specialist to install a super fancy computer that can essentially replace her. Desperate and scared, when hottie CEO of this firm ends up hitting on her, she goes into instant survival mode. He persists and, well, there's paranormals all over the place in this town!
In general, the larger story revolves around territorial disputes over blood between vampires. There's good vampires, bad vampires, and some people that are somewhere in between. Liese, however, handles vampires a lot easier than she does guys who are genuinely interested in her. Her trust issues are *massive* and take a lot of hand holding to overcome. Do we get there? Sure! But it takes a lot of bad decisions along the way that had me cringing and dreading the next turn of the page. Like I said, though, we get to a good happy ending, and there's lots of smutty goodness on the way.