There is a delicate balance that short stories need to strike, where readers need to know the characters enough to be invested in them, and need a decent conclusion to either the action or the romance (or both!) in order to work. That’s a lot to cram into a small format, and NIGHT SINS only manages to make you care about the characters. There were so many loose ends that I was frankly surprised by the last page turn.
I found Kayla a bit difficult to get to know, but by the end I liked her. As a Watcher, a concept which is kinda explained in the prologue, she is charged with protecting Las Vegas from the things that go bump in the night.