The Masquerades of Spring, by Ben Aaronovitch

This is great fun - a Rivers of London novella set in New York in the Jazz Age, narrated by the woosterish Augustus Berrycloth-Young. Gussie has fled London and the stern wizards of the Folly because he's been using magic for daft pranks. Then Thomas Nightingale turns up on his doorstep, seeking help to track down a magic saxophone...

It's a fast-moving, quick-witted caper, full of pithy one-liners but grounded in the real history of the jazz and drag scene, prohibition, racism and homophobia. That makes it sort of Dashiell Hammett as written by PG Wodehouse, with some magic mixed in - and not nearly as easy to pull off as Ben makes it look. 

Of course, he has form here. That use of a specific time and place to add some heft to the adventure is the same trick as in Ben's Remembrance of the Daleks (which I adore). Just as that story hinted at hitherto unknown secrets in the Doctor's past, this novella provides some tantalising clues about the early life of Thomas Nightingale.

There's another link to Ben's TV Doctor Who in that Peter Walmsly is, here on p. 29, a reverend who led prayers at Casterbrook school of wizardry, decades before his stint as an archaeologist for the Carbury Trust.

I found it compelling and read it in a day. It closes with the prospect of many more such adventures for some of the principal figures here. Yes, please.

Rivers of London novels I've also blogged about:

• Lies Sleeping
• False Value
• Amongst Our Weapons

Rivers of London novellas:

• What Abigail Did That Summer
• The October Man