A significant part of the pleasure of any of the Rivers series is the part where the magic-using police officer gets to explain to someone else that there is real magic, but that it's hidden by agreements between nations after WWII. Just as part of the fun of Dr. Who is the doctor getting to explain about the tardis.
Another pleasure of reading the books in this series is the cast. Many a writer would set a story in a modern German city and have an exclusively white-by-default cast. It doesn't have to be a big thing or a plot point, although there is one minor detail revealed only because someone is Black and it's a tiny wonderful moment.
If the women or the mystery were stronger, it'd be perfect. As it is, highly enjoyable.