The Third Emissary (The Cohort Chronicles, #2)

The Roman Empire in the first century A.D.

A network of agents known as The Cohort is run by the powerful Roman politician known as Senator Tatius whose goal is to return the empire to its republican roots. When Emperor Caligula is assassinated by his own bodyguards in 41 A.D. and "Uncle Claudius" is put on the throne by the Praetorian Guard, The Cohort faces a challenge to its very existence.

Rome's plan to conquer distant Britannia requires control of an important naval base in Mauritania...