Because this one involves the murder of the Home Secretary, which is apparently a cabinet level position in the British Government (it seems to correspond loosely to a combination of the Secretary of State and the Head of Homeland Security, near as wikipedia can help me to figure out), it is one of the featured books in Chapter 12 of TSCC100, Playing Politics.
This is also the third Inspector Alleyn mystery, but is the first one that I've read. I am reserving judgment overall because it was obvious to me that there was a backstory to the characters that I didn't have.
The mystery itself was fun - by the time Inspector Alleyn gets called out to the deceased Home Secretary, who died on the operating table from a septic appendix, pretty much everyone is a suspect. He's been getting threatening letters from the local anarchists and Bolsheviks, and he's broken it off with a mistress who is taking it badly and who just happens to be, along with his former friend and hopeful swain of the above mentioned mistress, the nurse and surgeon, respectively. They've both recently threatened him because the nurse is not handling the rejection with equanimity. And then we have his rather bizarre wife, a Leninst nurse, and an anesthetist who is disturbingly fond of a hands on approach to eugenics.
I didn't get the relationship between Alleyn and Nigel Bathgate at all, and the relationship with his fiancee, the fair Angela even less. I think I need more data in order to draw any conclusions. It was enjoyable, but a bit farcical.
Unfortunately, the solution to the crime was just plain bad. I had to read the last two chapters three times before I was able to really absorb what had happened, and at the end I was still just puzzled about the entire thing.