Katherine Addison’s 2020 The Angel of the Crows is a standalone gas-lamp fantasy.
Near-fatally savaged by a fallen angel encountered in Afghanistan, Dr. J. H. Doyle, late of Her Majesty’s Imperial Armed Forces Medical Corps, returns home to England. Doyle’s pension is small; living alone will be impossible. Doyle is forced to look for a flatmate. Doyle is painfully aware that it will be an odd flatmate indeed who will be able to tolerate the doctor’s quirks.
Odd flatmate found: Crow, a consulting detective. Crow is also an angel.