A mystery of Roman Britain, featuring Libertus. Once again, Libertus is enmeshed in the murky politicking and scheming of wealthy Romans and the impact of their presence on the local and slave communities, and his own life becomes endangered in a quest for justice.

This is the fourth novel in a crime series set in Roman Britain and featuring amateur sleuth Libertus, a freedman and pavement-maker. Libertus is in Londinium when he is asked to investigate the murder of the chief corn officer.