Libertus is in Londinium, at the invitation of the Roman Governor, when news arrives of the brutal murder of Caius Monnius, the city's chief corn-officer. Still reeling from the shock of catching sight of the wife he lost to slavery 20 years earlier, only to lose her again, the ever-inquisitive Libertus is, for once, uninterested in unmasking the murderer. But when the Roman Governor asks you to investigate, you can't say no. The dead man's mother is convinced that the truth behind the killing lies with Fortunatus, a celebrated charioteer with whom Monnius' wife was having an affair. But with the discovery of a second corpse, it soon becomes clear that this case is more complex—and more sinister—than anyone ever expected.