More like 3.5
Although I didn't like this as much as the first book in the series, Saylor still managed to bring the Roman culture vividly to life for me. The historical parts were excellent but IMO the mystery was a little lame. Gordianus 'The Finder' stumbled through this one and didn't seem to do much finding, always seemingly on the back foot, reacting instead of being proactive right up until the final big reveal. Despite this, it was still an enjoyable addition to the series and I'm planning on reading the next one.
Buddy read with Kim :-).