This is the follow-up book to Luna's other crime novel, "Two Girls Down." Although it's not essential to read the other book first, it does create more of an established tone if you're already familiar with the characters. "The Janes" centers around a human trafficking ring (so basically trigger warnings galore) that deals in young girls who've entered the US from Mexico. When two of the girls are found dead, kick-butt PI Alice Vega is hired to take on the case. Of course, she enlists her partner from the first novel, ex-cop Max Caplan, to tag along. I really enjoy how Luna's writing is very straightforward so it's easy to follow along with plot twists. Her books are always pretty fast-paced too, which is great for this type of novel.