The Masquerades of Spring: Ben Aaronovitch

New York City, New York.
Meet Augustus Berrycloth-Young – fop, flaneur, and Englishman abroad – as he chronicles the Jazz Age from his perch atop the city that never sleeps.
That is, until his old friend Thomas Nightingale arrives, pursuing a rather mysterious affair concerning an old saxophone – which will take Gussie from his warm bed, to the cold shores of Long Island, and down to the jazz clubs where music, magic, and madness haunt the shadows…