The Birdcage Murders by Karen Baugh Menuhin
A man was killed at a dinner at Brundals, a private men's club in London. Lennox happens to be a member although he hasn't been there for years, so Scotland Yard asks him and retired Inspector Swift to go to the club and be the Yard's eyes and ears. Swift is delighted to be working with the Yard again, and while Lennox is a little leery of spying at first, the case soon captures his attention.
I have read a lot of mysteries, but I think this may be the first I've come across with this particular method of murder. It's dreadful and very upper-crust. It turns out that all of the people in the dining room when the murder occurred are connected to an unsolved case from 12 years ago when several people were killed when a birdcage automaton exploded.
This is the 8th in the series and by now we know Lennox, Swift, and the crew well. I always...