Moon Over Soho by Ben Aaronovitch (Peter Grant #2)

Body and Soul. The song. That's what London constable and sorcerer's apprentice Peter Grant first notices when he examines the corpse of Cyrus Wilkins, part-time jazz drummer and full-time accountant, who dropped dead of a heart attack while playing a gig at Soho's 606 Club. The notes of the old jazz standard are rising from the body - a sure sign that something about the man's death was not at all natural but instead supernatural.

Book by author Ben Aaronovitch.