When mutiny erupts aboard a civilian cargo ship carrying 200 In Vitro embryos, Cooper faces a difficult decision-should he protect his fellow soldiers, or join forces with the rebellious Tanks?

The Saratoga becomes a pressure cooker of violence and political intrigue when an assassination on Earth forces a delegation of UN officials to use the craft as the site of an important conference.

A failed rescue mission leaves the 58th presumed dead, except for Nathan, who lands in the hospital, where a nagging memory that his comrades are still alive is passed off as a result of suffering from severe head trauma.

The 58th enters the tunnels to try to find and destroy a Chig ammo dump. In the tunnels on the way to the ammo dump, Lubin is killed, and Damphousse predicts that one more of them will die.

West discovers that his brother has enlisted in the Corps and is serving under a young, gung-ho lieutenant who's so determined to make a name for himself as a soldier, that he will risk endangering the lives of his entire battalion.

On a planet overrun with Chigs, the 58th retreat with a tank driver of the US 7th Cavalry upon a tank named "Pearly". They encounter the eccentric Major Cyril MacKendrick, sole survivor of a battalion of the British Coldstream Guards. Wang encounters a Silicate of the same model that previously tortured him.

The 58th is deployed to a seemingly barren moon to make final preparations for a major offensive by the Earth forces, but when they arrive they discover that the moon is home to an unknown species-and that Operation: Roundhammer may cause its extinction.