Lustrum is the deserving sequel to Harris's Imperium - though it is also readable on its own. It picks up where the first book of the trilogy-in-progress left off: Cicero has just been elected consul. The year 63BC begins. Cicero is faced with the same hostility from corrupt senatorial peers, oblivious to threats from the immensely wealthy Crassus and the rising stars of popular Rome that are Caesar and Pompey. But Cicero also makes mistakes. He turns down a land law amid rural distress, debt, and a grain shortage. The demagogues soon seize upon this to launch the murkiest and most desperate conspiracy the Republic has seen. This is led by none other than Catiline, the debauched patrician playboy whom Cicero had to defeat at the consular stakes. And Catiline has friends, he is unafraid of violence, and is bent on vengeance.
Cicero's life was eventful in itself, but it also took place within the most tumultuous of Roman times. And Cicero's own writings were profuse. So Harris's trilogy can afford to rely on, at times becoming almost a palimpsest of, the original documents, and the Imperium series are that rare thing: a historically faithful work that is at the same time a great yarn. Though I'd read and enjoyed some Harris before, I heard of the Ciceronian trilogy through an eminent professor of classics. She said she found no historical mistake in it, and that it captures the spirit of the times as she imagines it. This is isn't to belittle Harris as a storyteller. He knows when to build anticipation and what to insist on for drama. The idea was brilliant of having the story told by Tiro, Cicero's slave secretary, who actually existed and wrote a lost biography of his master. If anything, Lustrum offers more action and tension than Imperium. It is also darker, beginning with the murder of a child, and more lurid, answering our fantasies of Roman decadence.
Lustrum became the term for the five-year period between each taking of the census, when the censors purged the morally unfit from the body politic, especially from the senate. As the late Republic's conflicts became increasingly acrimonious, one after the other of the censuses failed to be performed - and Cicero became ever more anxious at what he saw as a double tale of moral and constitutional decay. We will eagerly be awaiting the final episode of Harris's trilogy: into the Civil War.