This is the sixth in Ben Aaronovitch's Peter Grant series and I've read, or listened to, them all. Here's what the blurb says:
Suspicious deaths are not usually the concern of PC Peter Grant or the Folly, even when they happen at an exclusive party in one of the most expensive apartment blocks in London. But Lady Ty's daughter was there, and Peter owes Lady Ty a favour.
Plunged into the alien world of the super-rich, where the basements are bigger than the house and dangerous, arcane items are bought and sold on the open market, a sensible young copper would keep his head down and his nose clean. But this is Peter Grant we're talking about.
He's been given an unparalleled opportunity to alienate old friends and create new enemies at the point where the world of magic and that of privilege intersect. Assuming he survives the week . . .
If you've never read one of these delightful novels this may sound a bit mystifying. The clue is in the last paragraph - 'the world of magic'. For Peter, and his boss, the suave ageless Nightingale, operate from the little known branch of the Metropolitan Police known as The Folly, located in an old house of that name in Hampstead, north London. Although more or less bound by the rules of the Met, they are also what is known as Practitioners - practitioners of the ancient arts of magic, that is. Viewed with a rather beady eye by the more conventional members of the police force, they are nevertheless called in when a case shows obvious signs of some magical elements.
Here, we find the police investigating the death of a young woman at a party in a very posh apartment block. Peter only goes along at the request of his girlfriend Beverley's sister, Lady Tyburn (both of them are members of a family known as the Rivers of London - river goddesses, indeed), who is anxious to keep her teenage daughter out of the investigation. But it soon transpires that some very dodgy dealings have been going on, involving a shady character known as Reynard the fox and, more worryingly, Peter's old enemy and would-be killer the Faceless Man. Peter's one-time friend Lesley, now gone over to the dark side, is also involved. And everyone seems to be after the elusive third volume of Isaac Newton's Principea - that's the one that deals with magic, in case you're wondering.
Existing fans of this series will know what to expect and will not be disappointed. In the first novel, Peter was a very new recruit to the world of magic, but his skills have increased a lot since then and he can conjure up werelights and cause explosions effortlessly. But don't go thinking this is all a bit twee and childish - it's a proper thriller, a police procedural, in fact, and one of the great joys of these novels is the juxtaposition between normal policing and the added elements brought in from The Folly. Peter is an immensely attractive character, and tells his story here with his normal ironic wit. It has to be said that the ending came as a bit of a surprise, as nothing is really resolved - presumably there will be a sequel? Also, there were many references back to earlier novels which were not fully explained, so I did wonder if the book would be as enjoyable is you hadn't read the others in the series.
I listened to this on Audible, excellently read as always by Kobna Holdbrook-Smith - and there's a bonus feature at the end, in which the reader and the author respond to questions. All great fun.