To stop the virus, enemies must become friends.

After two months in Skyhome, Alex and the crew are rested and healed from their ordeal in Bunker One. But the war against the xenovirus is only beginning.

They must leave the safety of the space station to gain the favor of Emperor Augustus of Nova Roma. But when disaster strikes outside the capital, the team must scramble to save one of their own.

It's a fight that pits them against the Empire's finest. But even Nova Roma isn't immune to the xenovirus or its newest evolutions...