I picked this up mainly because the subject matter of a Roman Empire that never fell but survived into the modern time sounded very appealing. I still think that a good novel can be based on that premise.
"Romanitas", however, definitely ISN'T that novel. Instead, it's very long-winded, very cliched, and ultimately highly disappointed airport reading material.
The first of many problems is that the alternate setting simply isn't worked out very well. It's basically way too similar to the world as we know it, except for the fact that slavery and crucifixion are still common practice. Gruesome as that may be, it's just not enough for a convincing alternate reality.
Not that it really matters, since the alternate setting only serves as a very flimsy backdrop for a dime-a-dozen chase plot that could take place basically anywhere and any time. It's an extremely weak plot, with lots of cliches, a very predictable flow, and a lot of contrivances like two of the three protagoningts having (unexplained) supernatural powers.
To make things even worse, all of this is told in an incredibly heavy-handed way. It's not strictly badly written, but it takes itself way too seriously, and it's atrociously paced. Page after page are filled with the (predictable) thoughts of the main characters, while very little actually happens. Also, none of the characters came across as very believable, interesting, or even likeable. The girl protagonist was simply obnoxious.
Ultimately, you can safely save yourself the trouble of reading this book. It's long-winded, predictable, and doesn't do anything of interest with its admittedly intriguing premise.
* out of *****