Torres is put in the brig for attacking Jubail, who agrees to drop the charges as repayment of his debt to Marsh (who spared his life in The Embassy). Barca learns that the GRAF shield is inoperative, and is discovered by Jubail as he tells Typhonus. In the struggle that ensues Barca kills Jubail, and tells the guards that arrive that Jubail was the spy. Typhonus orders an attack on unprotected Io, and the ExoFleet abandons the base. When Typhonus pursues them, a Pirate fleet from Chaos decloaks on the Neos' flank, and starts to do damage tto he Neo fleet. The Neo fleet returns to Mars, where Typhonus is executed for his incompetence.
The General Assembly commissions Exosquad to eliminate the Tethysian Pirate.
Marsh and Marsala coordinate with the Chicago resistance to free the imprisoned members of the Homeworlds Congress. Napier encounters Amanda Conner, his ex-wife, who is conducting interviews there.
Phaeton's scientists have succeeded in creating a Neo sapien that looks like Alice Noretti, who was a member Able Squad when she was killed. Phaeton places her on a Terran worker transport, having learned that the Resistance plans to free the workers. Phaeton assumed (correctly) that she would be placed back with Marsh's squad, and since Marsh was a favorite of Winfield it would only be a matter of time before Noretti got the opportunity to assassinate Winfield. Meanwhile the Marsh/O'Reilly romance seems to progress, but is hindered by the arrival of Noretti. Marsala begins to notice clues that indicate Noretti is a Neo, but Marsh is in denial when Marsala shares his suspicions. Winfield decides to go to the Venusian surface to examine the situation and mingle with the troops, and of course expects to meet Marsh. Noretti acts, and has the opportunity to kill Winfield. But an identity crisis prevents her from doing so, for she embraces her Alice Noretti persona. She then tries to fight her way past various e-frames and jumptroops, but after getting hit by O'Reilly her e-frame crashes into the canyon wall, killing her.
An attempt by the ExoFleet to covertly land e-frames on Mars to investigate a gigantic complex fails miserably, with most of the e-frames destroyed and pilots killed, because a spy tipped off the Neos to their arrival. That spy is Barca, who has Able Squad (the only survivors) captured, and proceeds to plot with Typhonus. The plan is to load a Neo ship, which Barca will claim to have captured, with explosives and then get it close enough to the Resolute II that it will be caught in the explosion. Hallas helps Able Squad escape, and the Neo ship destroys Barca's own ship rather than the Resolute II.
Napier escapes with Marsala. Despite his own objections, General Shiva complies with Phaeton's demand that he capture Marsh alive. Shiva offers to let everyone else within Parliament House go in exchange for Marsh, but Tyree refuses. The attack is launched and the resistance quickly loses ground. But Butler's company of jumptroops arrives, and they are able to capture Shiva. In exchange for his life, Shiva lets the surviving members of the Australian resistance go.
The capture of Marduk, a Neo sapien who has supplied the ExoFleet with information, prompts Winfield to send two exosquads to Mars. Eventually Typhonus uses the spy as bait to ensnare the exosquads in a trap, but is not entirely successful. Torres gets shot down and rescued by some ExoScouts.
Marsala is kidnapped by former members of the Venus resistance, who demand that all Neo sapiens, whether loyal to ExoFleet or not, be deported from the planet. James Burns, who has been fitted with prosthetics, decides to help his sister and try to rescue Marsala alone. He is able to infiltrate the kidnappers' ranks by pretending to be sympathetic to their cause, and later tries to sneak Marsala out. Some Neo sapien holdouts attack the encampment, and though James is able to save Marsala, it is at the cost of his own life.
Torres, believed dead by her fellow ExoTroopers, takes charge of the ExoScouts that found her. A few of them resent this, and while she tries to lead them all to her exosquad, they arrange for her to have an accident that they believe results in her death. The ExoScouts are then captured by a group of raptor Neo warriors, which had been dispatched by Typhonus in the hopes that the ExoScouts could reveal the location of the exosquads on Mars. But Torres is not dead, and she manages, one by one, to free the ExoScouts who then truly follow her. Meanwhile, Able Squad and the remainder of Baker Squad have arrived at the site of what they believe to be an underground Neo complex, but they discover that it is something far more unusual.
Torres, Bronski, and Takagi return to Canberra to provide air cover for a withdrawal attempt by the resistance. The attempt fails miserably, and they are forced to retreat back into the Parliament House. Weston stayed with DeLeon to try to fix his e-frame, and they come under attack by lizard Neo warriors. They escape to an aborigine camp, but are followed there. They lead the Neo warriors into a trap and destroy them with a rigged fusion pak. Napier escapes with Marsala in the cloaked e-frame.
Able Squad blasts its way into the alien complex, and is pursued inside by Typhonus and his troops. After a battle which is made more difficult by interior defenses, Able Squad escapes into a different section. Meanwhile the alien structure begins to grow out of the ground. After the exosquad has blasted its way out and come to the aid of the jumptroops with Professor Algernon, the spire begins emitting great energy waves.
Both Marsh and Typhonus make seizing the alien technology their top priority. Both the ExoSquads and Neo frames make it to a central complex, and a battle follows. A fusion pack explosion in the core causes the alien complex to begin to self-destruct. Everyone tries to frantically escape, as the planet itself suffers from quakes and lava flows. Soon after the ExoTroopers and Torres with the ExoScouts escape, the planet Mars is destroyed in a gigantic explosion.
Phaeton gives orders to Lucullus to begin work on a bunker underneath Phaeton City. Marsh attempts to rendezvous with Marsala and Felson in Maine, but realizes Turner's treachery and is able to escape the trap set by the Neos. The Neo megas claim Marsala's body, and take him to their base on Maniton Island, where they revive him. Galba and the others explain that they want him to kidnap Phaeton, for he will not surrender despite the fact that the Neo sapiens are losing the war. That way they can take charge and make peace. Marsala reluctantly agrees to their plan. Meanwhile Picasso has discovered that Phaeton is in the tunnels beneath the city. Once he notifies the Resistance they mount an operation, including Marsh, to go after Phaeton. Beneath Phaeton City, the Resistance attacks and Phaeton blames Lucullus and Gracchus. As Phaeton goes to join the battle he is ambushed by Marsala. Lucullus and Gracchus use the confusion to try and shift the blame for the Resistance assault on Livia. Phaeton is able to escape from Marsala by exiting his e-frame and utilizing the fact that the Auto Mutation Syndrome has somewhat liquefied his body to enter a sewer pipe only a few inches in diameter. As Marsala is leaving he comes across the Resistance in full retreat, and their chances of escape do not appear to be good. Marsala fires a few missiles to collapse the tunnel on the pursuing Neos. Lucullus and Gracchus, assuming that Phaeton is dead, begin to organize a purge. Phaeton arrives on the scene, however, and has them arrested instead.
Marsh finds himself in New York, facing down a group of Neo-Warriors sent to hunt him down (you'd think he threw Phaeton off a mountain or something). He encounters the last cabbie in New York, Sidney. Marsh eventually outwits the Neo-Warriors but the Torch on the Statue of Liberty is destroyed in the process. Marsh makes his way to the Resistance, while Sidney stays in New York.
Marsh, Burns, and Marsala go to South America to retrieve a Terran geneticist named Ketzer, who the ExoFleet hopes will help them discover a weakness in the Neo lords. Although they destroy a Neo patrol they encounter, Draconis becomes aware of their presence in the rain forest. The three are then attacked by green humanoids, who succeed in capturing Nara. They take her to their village. She awakens with her arm hurting. Ketzer is there, for it was he who altered the natives, as well as himself. Ketzer notifies her comrades of her whereabouts, and they soon arrive. The Neos also pick up the signal, and Draconis is convinced by Medusa that he will be rewarded if he were to personally lead a successful attack. Medusa then reports to Livia that Draconis only serves for the sake of his own gain, not out of loyalty. Ketzer asks for the help of the ExoTroopers in attacking the nearby city Manaus. When they refuse he reveals that he has injected Nara with a retrovirus that will alter her DNA to make her like them, but has a compound that will prevent it if they help him. Just then the Neos launch an attack on the village, forcing both the villagers and the exotroopers to flee. Draconis is killed for disloyalty on Livia's order by a group Neo lords, ending Neo pursuit. Marsh tells Ketzer to recreate the compound that will cure Nara, but Ketzer says that he lied when he said there was a cure. Marsh wants to take Ketzer back to the ExoFleet, as were his orders, but Ketzer escapes when his altered humans distract the exotroopers with the possibility of an attack.
Phaeton has Shiva take most of what remains of the Neo Sapien fleets to Venus in a final attempt to destroy the ExoFleet. With the Resolute II undergoing repairs, Admiral Winfield takes a large portion of the fleet towards Earth in an attempt to fool the Neo Sapiens into thinking an attack is imminent, and therefore withdraw to defend Earth. Shiva calls Winfield's bluff, and proceeds with an attack on the fleet at Venus. An E-frame assault on the Neo Fleet fails, but a follow-up by torpedo boats inflicts heavy damages on the Neo Fleet. Shiva then personally leads an e-frame assault, but is shot down and dies as the attack fails.
A mission to deliver explosives to Earth Resistance lands Bronski and Takagi in Alaska, where they meet up with the Chicago resistance. They must place the explosives on a train so that the base to which it is going will be destroyed. But when they discover some of the cars carry many of the world's greatest art creations, Hanley hesitates. So they steal the cars with the art, plant the explosives in the particle accelerator, and get the empty cars destroyed so the Neos will stop looking for them. The rest of the train makes it to Great Slave Lake in Canada, where it explodes the next day.