Catt Out of the Bag

Japanese edition of [Catt out of the Bag] by Clifford Witting. How, where and why was a man suddenly removed from a group of carol singers on that cold night? It appeared that someone else as well as Mrs de Frayn was a clever organizer; every cog in the machinery of this crime was smooth running, and as with a perfect machine, no flaw could be detected in the "finished" product, at least, until......