This is the thirteenth outing for Inspector Thomas Pitt of the Metropolitan Police in London of 1890 -- and also his last before being promoted to Superintendent of the Bow Street station. The social theme this time (Perry always includes one) is the superstitious viciousness of Victorian antisemitism and the violence that sometimes resulted. Five years before, a gentleman was not only murdered in a blacksmith's yard at night, he was crucified to the stable door with horseshoe nails. Only a Jew would do that, right? Public horror, combined with a rush to judgment on the part of the police and the courts, results in the hanging of an actor whose sister has been agitating ever since to prove him innocent. Then Pitt nearly witnesses the death by poisoning of one of the appeals court judges at the theatre one evening, and the whole thing has to be reopened, whether anyone likes it or not. His wife, Charlotte, takes part together with her mother, Caroline (sister Emily is off in the country, pregnant) -- who has also developed an unfortunate attachment to another Jewish actor, about which Charlotte is naturally upset. The investigation of what eventually becomes three murders is interestingly done -- and without the deus ex machina of the Inner Circle, this time.