I do think these realistic covers for the Matsumoto Seichou pockets look really good...
Soushitsu no Girei was originally serialized in 1969 and published as a standalone book in 1972, and while this is not a major work by Matsumoto like Ten to Sen (Points and Lines) or Suna no Utsuwa ("Vessel of Sand", also known as Inspector Imanishi Investigates"), the book has been adapted for the small screen no less than three times, with the last one even dating as recent as 2016. Matsumoto Seichou is of course best known as the main figure of the shakai-ha (social school) movement, a post-war school of Japanese mystery fiction that places emphasis on the social backgrounds of crimes, which is usually often juxtaposed against honkaku orthodox puzzle plot mysteries. The best known Matsumoto stories has him zoom in on the people getting involved with the crimes in his books, not rarely victims of company politics who find themselves, often due to circumstances beyond their control, forced to commit some kind of crime. I am not a big fan of shakai-ha mystery in general (there are always exceptions), and I therefore don't read Matsumoto's work very often, but there are works I like very much (Ten to Sen and sequel Jikan no Shuuzoku are police procedural puzzlers like Crofts' work).
Soushitsu no Girei was a book I honestly didn't know anything about. It certainly doesn't have the reputation of Ten to Sen as a puzzler, so why did I pick this book? Well, actually, the reason is very simple. I was just looking for a mystery novel with the case set near Jindaiji Temple and happened to come across this one. I quite often just look for mystery books with a specific location, or plot device, or something like that, so I just happened to find out about this book and it was on sale.
Having read the book now however, I wouldn't say this is a must-read by Matsumoto by any means. It's a very slow police procedural, where we follow Ootsuka and Suda in their investigations into possible motives and suspects for the murder, but I can't say the plot really impressed. The first part is very slow, with the police trying to learn how Sumida ended up in the hotel in the first place, but a lot of it turns out, in retrospect, to be just padding by the author, as there's no real explanation why Sumida used such a roundabout route to end up in that hotel: that part only exists to allow for a longer investigative segment. This happens more often, with parts that feel like they are only there to pad out the story, but which don't feel natural because while they temporarily offer "a mystery" to the reader ("Why did X go to this place first before going to the next?" etc.) the answer often barely changes anything about what we already know about the case, and in some situations, the answer still leaves you wondering why they did that, because no adequate explanation is given for what compelled X to do this or that, just an explanation they did it.
This becomes apparent when you start thinking about the actual way the investigation developed in this book. Coincidence plays a big role in this book, but not in an interesting meta way like in Yamaguchi's Kiguu! Here we have both the culprit and the police learning things by complete coincidence, like a police detective who happens to run out of cigarettes, walks into the store nearest by and there happens to be a person holding very vital testimony concerning the case. Or the culprit learning certain facts incredbibly convenient to know to commit the murder in that particular way, but again, the only they could learned that information is through luck. So much of the developments in the investigation feel artificial, which is weird because it should be down-to-earth police procedural with a focus on realism, following Matsumoto's own style, but much of what happens in Soushitsu no Girei feels very forced Why did the police for example need to examine the haiku group in such detail at that point of the story for example? Only because it'd become relevant again later on.
Not to say there's nothing to like about this book. I do like the broad strokes of the story: trying to tie the two murders in Nagoya and Jindaiji, the possible motives behind the individual murders and one that connects the two, the creepy way in which the murders are committed, some of the actions taken by the culprit to evade suspicion, the idea behind the parts concerning a mysterious woman with red hair, and the actual motive and the way it ties back to the title are all elements and concepts I do like, only the way the investigation is built up and tries to guide the reader from the initial murder all the way to the discovery of who it was and how and why has quite the few speed bumps that makes you hit your head more often than you'd want. Now it makes me curious to the adaptations, to see if they changed the flow of the investigation a bit while keeping the basic building blocks.
Soushitsu no Girei is thus not a must-read by Matsumoto. Not that I was expecting it to be one, but while it had a few points I did find interesting, I think the overall book is not remarkable enough to really warrant a recommendation, especially not if you're mostly reading this blog because you want to hear more about puzzle-plot focused mystery fiction. Oh well, I guess I was just reading this book only because it was set at Jindaiji, and at the very least, the book did exactly that!