Divided we fall...Mathison and his Marines have been reunited, and they've found unlikely allies in their mission to save humanity, which is currently tearing itself apart. SOG systems are rebelling, the Republic wants to run away... and then there's the whole invasion of the vanhat they have to contend with.The Last Marines have a new weapon, but it's Republic technology, and the Republic forces are going to take it with them when they flee. So even though the Republic has betrayed the Marines, they must find and warn the Republic fleet... and do whatever it takes to get their hands on the technology. The Marines have one chance to save the Republic, but time - and the rest of humanity - is against them.Surrounded by people he doesn't trust - including a SOG commissar and troops from the Republic - Mathison will have to forge them into a team and track down the Republic before they leave... or humanity is doomed.