The SPQR Series - The book series

In the year 70 B.C., Decius Caecilius Metellus the Younger, high-born commander of the local vigiles, is determined to investigate a series of mysterious killings in his city. Despite official apathy, brazen bribes and sinister threats, Decius uncovers a world of corruption at the highest levels of his government that threatens to destroy him and the government he serves.