Books in Inspectr Roderick Alleyn series

In 1968 Ngaio Marsh took her own Roman holiday (in part to research Italian police procedures) and the change seems to have done her good: Both her British and U.S. agents believed When in Rome to be the finest novel in her "Inspector Alleyn" series. As is so often (and so satisfyingly) the case, the tale concerns a murder within a closed group—in this case, a group of tourists visiting what Marsh calls the "Basilica di San Tommaso," who find themselves fumbling into a complex web of blackmail and drug-smuggling. Adding some irresistible color are depictions of both La Dolce Vita (of which Marsh took a jaundiced view) and the student radicals of the day, whom she seems to have found somewhat more persuasive. All in all, a brilliant example of classic Golden Age plotting melded with a decidedly Space Age cast.

We do love a man in a uniform, but the "Constables" in question are not policemen but paintings—the landscapes, specifically, of the 19th-century painter John Constable. Agatha Troy (the artist wife, you’ll remember, of Inspector Alleyn) has a special fondness for Constable’s work, so she jumps at the chance to take a river-cruise through "Constable Country" in the east of England. Her enthusiasm dims a little when it becomes clear that the ticket became available at the last minute only because a previous passenger was murdered in his cabin—and murdered, it seems, by a notorious international criminal known as the "Jampot." (How we long for the days when notorious international criminals had really cute names.)