Slumber by Tamara Blake
When I saw that this was about a girl working as a cleaning woman at a mysterious manor house, I was hoping it would have some Gothic elements, but instead, it's pretty much straight paranormal. This was a quick read and entertaining at times, but nothing particularly memorable, and the writing and characterization were mediocre at best. There was at least one giant plot hole that bothered me, though the rules of magic in this world were consistent, which is a point in its favor. This wasn't terrible, but there's nothing in it that would make me recommend you go out of your way to read it.
(I got my copy from Netgalley.)