At first glance, this is part of the Dominion of the Fallen series, but actually isn't. It's probably set in the same world, but appears to be very much further in the future, featuring skyscrapers and computers. It does not share the Parisian setting either.

A witch teams with a human and a Fallen to investigate a series of murders.

I thought it a bit weak, especially on the world-building - if the world has been comprehensively trashed by the Fallen and their wars over several centuries, how did humanity develop a technological society? The post-Edwardian apocalyptic setting of the main series works better in that respect as it suggests the Fall was more recent.

Whodunnit with Fallen Angels and witches. Bit of a Deus ex Machina at the end, but the rest was fast paced, short and snappy, well done. ( )