A standard and fun modern tongue-in-cheek crime/mystery story, uplifted by being set in a magical-realist London where the eponymous (a word never to be used in serious writing) rivers of the eponymous capital city have deities who are alive and active.
It’s been a few months since I read it, so I’ve completely forgotten the crime plot, but can remember vividly the goddesses of the Brent and the Fleet, and Old Father Thames himself. Reminds me of the Douglas Adams book (one of his Dirk Gently series?) where the London homeless are in fact the old Norse gods, and slowly one wonderful night converge on their Valhalla – King’s Cross station.
I wonder if the Percy Jackson books are similar?