The Ring that Caesar Wore

Leonidas begins a job working as a builder and almost immediately stumbles across a valuable ring. Cassia realizes is very, very old, and has more significance than just being a trinket. The ring is key to unlocking a possible conspiracy against Nero, and the princeps commands Leonidas and Cassia to uncover the plotters by any means necessary.
But the ring and conspiracy is just the tip of the troubles that Leonidas uncovers, bringing danger very close to home.