The Legion [Cato, Book 10]

“In the first century AD, the Roman Empire faces a new threat from its long-standing enemy Parthia. Parthia is vying with Rome for control of Palmyra an officially neutral kingdom. Palmyra's royal household is on the brink of open revolt, and so a task force under the command of experienced soldiers Macro and Cato is dispatched to defend its king and guard its borders.”