I was lucky in that when I finished French’s second book, this one was immediately available at the library. So, I read them back to back which was good for remembering small details about the characters since there is a little overlap between books, but not much. This was a terribly sad novel outlining the backstory of Cassie’s boss the guy who runs undercover and how he came from a ratty working class neighborhood and about the teen mystery/disappearance that haunted him and his family. Quite good, very chilling but well done and not at all tawdry. Can’t wait to read her next one.