River of Darkness takes place in England shortly after WWI. Scotland Yard is investigating a murder outside of London and stumbles on a terrifying serial killer - now they have to catch him before he strikes again.
I really liked the characters, even though there were a lot of them, I felt like they were each pretty interesting and well rounded. The plot was well done and the pacing was great. The author doled out breadcrumbs at a steady pace, which really kept me interested in the story.
The only thing I didn't like was the Freudian psychology angle. I know it's accurate to the time period, but Freudian psychology and theories just creep me out because we now know they're so, so wrong. That being said, it's a fairly small part of the book, and I know that that's my own personal issue, so I just moved past it and didn't let it ruin a really excellent mystery novel.
If you like mysteries, I'd definitely recommend this one.