"Rivers of London"

Recommended: "Rivers of London" by Ben Aaronovitch.

He knows his London, he knows his rivers (amused to see the Beverley Brook taking a major role!) and the actual plot -- which has little to do with the title -- is good as well.

With hindsight I'm reminded of Michael Scott Rohan's "Chase the Morning" series, incorporating magic, legend and obscure history (yes, the Macklin 'actors murder' really happened, although I assume the Henry Pyke element didn't...) into a rich seam of imagination with compelling characters, though this one substitutes police procedural for the swashbuckling adventure elements. While I'm no expert, the author appears to know his policing inside out as well!

Very readable: it kept me up until the small hours, although part of that was because I had to give the book back the next morning...