It features several tropes of the genre that normally turn me off:
1) the protagonist carries deep psychological scars that may or may not have anything to do with the case, but she’s still a bit of a Mary Sue in that she’s basically successful in everything she does;
2) the villain is a generic criminal mastermind with intense but poorly developed motivations who’s capable of committing extremely complex yet flawlessly executed murders (and other crimes) in multiple states at once;
3) the supporting characters, including the police, are borderline incompetent and exist mostly to sit around and worry about how dangerous the villain is while the protagonist hitches up her panties and takes care of business.
While these may or may not be actual flaws, there are some real problems, such as the ending is wrapped up a bit messily and the villain’s plan makes absolutely no sense whatsoever. But if you can get past all that (I personally found most of it charming), it’s an enjoyable read. The narration if not the dialog is well-written, the story is fast and thrilling, and the protagonist is interesting, engaging, and sympathetic.
The protagonist and her psychological journey were interesting enough for me to ignore the flaws and enjoy the book. I look forward to reading more in this series.