Greywalker by Kat Richardson
Summary from Goodreads:
Harper Blaine was slogging along as a small-time P.I. when a two-bit perp's savage assault left her dead. For two minutes, to be precise.
When Harper comes to in the hospital, she begins to feel a bit ...strange. She sees things that can only be described as weird-shapes emerging from a foggy grey mist, snarling teeth, creatures roaring.
But Harper's not crazy. Her "death" has made her a Greywalker-able to move between our world and the mysterious, cross-over zone where things that go bump in the night exist. And her new gift (or curse) is about to drag her into that world of vampires and ghosts, magic and witches, necromancers and sinister artifacts. Whether she likes it or not.
This is a fun, fast read. Harper Blaine is a gutsy, smart P.I. who dies for a couple of minutes after an encounter with the step-father of her client goes horribly wrong. After this event, she can now see the Grey --the area between worlds where those people and creatures who are no longer alive dwell. The secondary characters in the book are fun too. Harper meets a couple who help her deal with her new reality - a practicing (real) witch and her husband, a professor who is mostly into the theoretical side of things. There is also a love interest who works at an auction house and Quinton, a new friend who helps with her tech and security needs. I hope that Quinton shows up in the subsequent books because he was interesting and there are all kinds of hints that there is more to him than meets the eye. The events in the book unfold quickly and it is hard to stop reading once things get going. I plan on reading the entire series. I have high hope for this one.