Read really annoyingly by Alanna Ubach, this novellette sounded interesting from the blurb, but it turned out to be yet another irritating first person PoV, which is worst person in practice, and it honestly had nothing to do with ghosts, not really. You could have taken the minimal presence of ghosts completely out of the picture and had very nearly the same story: a sixteen year old has literally nothing on her mind than boys.
Tiresomely, there's the trope bad boy that the mc falls for, and the standard issue best friend. Often I find I like the best friend better than the main character, but such was not the case here, so this story didn't even have that going for it. I actually didn't like anyone. I know this is a part of a larger world, none of which I'm familiar with, but that doesn't alter the fact that we had a weak and uninteresting main character, and a story which had nothing new to offer and not a thing to recommend it. I have no need now to read anything else in this world, nor anything else by Meg Cabot (and yes, it's ca-bot, not cab-oh, so there isn't even anything unexpected there).
Susannah Simon, the protagonist, is dating a ghost - she and other special snowflakes like her can physically interact with ghosts - but like I said, the ghosts may as well have been ordinary and very retiring people for all they contributed to the story. All that was left was your stereotypical and clueless high school girl in love, which is tedious, uninventive and done to death. Meg Cabot needs a new shtick, and she's not alone amongst YA authors in that respect.