Margery Allingham is an old favorite of mine, first discovered in adolescence (some decades ago now). I have reread most of the books several times over the years, but when my eye fell on this one on the shelf I realized I remembered nothing about it. That meant, first, that I probably hadn't read it in forty or fifty years and second, that it probably hadn't knocked my socks off the first time. But of course I had to pull it down and revisit it.
It's one of Allingham's later books, written in the fifties, when she had left the frivolities of her early books far behind and was pushing the boundaries of the mystery story, doing little novels of manners set in a slightly shabby postwar Britain. It has all of the hallmarks, with the eccentric characters and the offbeat settings in odd corners of London.
It's got Albert Campion, too, but he really doesn't do much in this book, besides watch his policeman pal Charlie Luke at work. He certainly doesn't solve a mystery, because there is no mystery. It's a suspense novel, in which we are introduced to a villain and some potential victims early on and watch as their paths converge.
An elderly London widow is fond of a young man without family whom she has informally adopted; she tries to play matchmaker by inviting a young niece from the country up to town with an eye to bringing them together. The niece has one friend in London, whom she contacts upon arrival. He doesn't like the setup, and neither do we, because we quickly find out that the young man is an utter sociopath, responsible for a series of murders.
Charlie Luke has a hunch about the murders, and he invites Campion along for the ride as he investigates. The point of view shifts among villain, victims in waiting and coppers as the situation evolves toward crisis.
It's witty, nicely written, evocative, all of the things we love about Allingham's stories; not the most complex or compelling entry in the series but a satisfying read for a fan.