★ Death on the Tiber

In 2013, Lindsey Davis, the author of the Marcus Didius Falco mysteries set in ancient Rome, embarked on a new series featuring Falco’s daughter, Flavia Albia, who learned the sleuthing craft at her father’s knee. In the 11 years since, Davis released the same number of well-crafted puzzlers, but her 12th installment, Death on the Tiber, represents a series high mark. As the story opens, the body of a woman is discovered floating in the Tiber River, setting off a gang war the likes of which Rome has not seen in quite some time. The victim was a British woman named Claudia Deiana, who had traveled to Rome in search of the man she believed to be her husband, Gaius Florius Oppicus, a previously exiled Roman mobster who has ostensibly returned to the fold, eager to resume his nefarious activities. Flavia is intrigued by Claudia and the manner of her death, and worms her way into the official inquiry—albeit quite unofficially. There is no dearth of suspects: the anonymous but exceptionally effective assassin from a rival gang; Florius Oppicus’ actual wife in Rome, or someone doing her bidding; and any number of opportunists looking to sow some chaos in the underworld. This is easily the most entertaining of the series to date. Flavia Albia is smart, independent, snarky and brutally funny, while the supporting characters are eminently relatable. Pro Tip: Davis begins the book with a list of characters, major and minor. Don’t gloss over it. It is very helpful for keeping the many characters straight; it’s also absolutely hilarious.

★ The Lost Coast

Clan Kellerman, I gotta say wow, just wow: I cannot recall another family of novelists quite so prolific and uniformly excellent. The Lost Coast, the fourth collaboration between pere et fils Jonathan and Jesse, finds PI Clay Edison conducting a routine investigation into the assets of the recently deceased Marisol Salvador. It does not stay that way long, as each newly unearthed discovery leads Clay deeper into the rabbit hole as he uncovers a series of cons that date back decades and continue, unabated, to the present day. His client bails upon seeing the complexity of the situation—and realizing the unlikelihood of a satisfactory resolution to the case—but Clay is intrigued and carries on pro bono. He journeys north to a mysterious California seaside community called Swann’s Flat, which is anything but flat: It’s borderline inaccessible even by four-wheel-drive. The residents are an odd lot; there are only 13 of them, and all but three or four are trouble waiting to happen. Problem is, neither Clay nor the reader can readily identify who falls into which camp. Clay eventually enlists the aid of Regina Klein, a PI who had once been involved in a peripheral part of the case, and who shares his curiosity. (An aside: I hope we see her again; she is potential series-star material.) Of all the Clay Edison books, this one is easily the most suspenseful—don’t miss it.

★ Murder at the White Palace

One of the more unusual professions for a mystery protagonist has to be running a lonely hearts club, but that is basically the job held by Gwen Bainbridge and Iris Sparks, the amateur but very talented sleuths of Allison Montclair’s Murder at the White Palace. The milieu is postwar London, circa 1947, and the holiday season is coming up. The pair decide to throw a New Year’s Eve party, but the venue situation is grim: All the large halls that survived the Blitz are booked solid. Iris, however, has connections; Her gangster boyfriend, Archie Spelling, owns a nightclub that, with any luck, will be renovated in time for their New Year’s bash. But repairs on a war-damaged wall unearth (or rather, “unbrick”) a dead body. Turns out the dead man was one of a group of suspects in a major crime against the mob, and although it happened before the war, there are those who would still like some answers as to where the swag from that crime ended up.  And others would equally like to keep that answer buried deep in the past. Which faction will outmaneuver the other, and how many people will die in the process? This is a terrific series, one that rockets to the top of my reading list whenever a new installment arrives, and Murder at the White Palace continues that tradition in fine fettle.

★ The In Crowd

Floating bodies seem to be a running theme this month, first in the Tiber, and now in the Thames in Charlotte Vassell’s police procedural thriller The In Crowd. This body, discovered by a rowing team out for their weekend exercise, is that of Lynne Rodgers, a suspect in an unsolved £10,000,000 embezzlement case. Fastidious DI Caius Beauchamp (pronounced the French way, “Bo-shom,” never “Beecham”) gets tapped by a prominent politician to take point on the investigation, although it is unclear what the politician’s motivation may be. Meanwhile, across town, an attractive young milliner named Callie is helping out with preparations for her friend’s high-society wedding. That she will meet Caius will come as no surprise to anyone who ever reads mysteries, but the interplay between the two moves the narrative forward in unexpected ways. Vassell skewers the ruling class and their pretensions exceptionally well, and you will cheer every time one of them receives their comeuppance. There is comedy, there is suspense and the dialogue is witty and incisive. And I didn’t guess the ending, always a plus for me.