It's now a few years later, and Acorna and Aari's daughter, Khorii, is being taken from Vhiliinyar, to her mother's adopted family on the Moon of Opportunity - or MOO, as it's known by - for a visit to get to know this side of her family better.
On their journey, they come across a derelict luxury liner, called The White Star, in standard, and her adopted Uncle, Captain Joh Becker, with his usual eye for scrap opportunities, persuades his Linyaari friends to pause for a while to investigate it.
As Acorna and Aari are resting, Becker takes Khorii and her cat, Khiindi, along with his first mate, the Makahomian Cat, RK, along with him. But Acorna and Aari wake up as they are leaving the Condor, Becker's ship, and insist that Maak, Becker's android first mate, and his son, Elviiz, go with them for safety.
What they find on the derelict ship, are hundreds of dead bodies, floating around in zero G, and Khorii notices a strange cloud of tiny dots floating everywhere.
They decide to access the ships computers, so they can get all the lists they'd need of passenger, crew, and cargo information, in order to report their claim to salvage but, half way back to the Condor, Becker's ship, Becker, RK, and Khiindi fall seriously, and suddenly, ill, with both Maak and Elviiz also being affected in their organic parts.
Khorii manages to make them well again, but, as they get back to the Condor, they decide to tow The White Star to one of Becker's nearby storage asteroid, so that it didn't become either a shipping hazard, nor a time bomb, as they all realised that most of the deaths were caused by a new plague.
As they get near to MOO, they're informed by a Federation broadcast that there is a plague in the Solojos System, and are asked if they could help save however many people are still alive but, as they're worried about taking Khorii with them into danger, so they agree to go after they've dropped her off with Calum and Judit at MOO.
As they near the moon, they contact it, only to be told that Calum had taken Judit to Kezdet, as her baby is now due, and that Gill and Mercy had gone with them. They decide that it's still best for Khorii to stay on MOO, with Elviiz and Khiindi cat to go with her for company, and so, with reluctance on both sides, they are left, while Becker, Acorna, and Aari go on towards their first stop.
From then on, it's a race between life and death, as more and more Linyaari are informed of the problem. Everywhere that Federation troops went, the plague follows, and Acorna and Aari become swamped with plague victims.
But, back on MOO, they also have problems, as their food supply ship is late, and then eventually arrives, but with the crew struck down with plague, too. The headmaster of MOO refuses to let the ship land, and won't listen to Khorii, as she tries to tell him that she can cure the crew and ship.
Then Khorii, Elviiz, Khiindi, and two school friends, Hap, and Sesseli, plot to sneak onto the supply ship so that Khorii can clear it of the plague, but, despite their reassurances to the headmaster that all is clear, he still refuses to let them land.
But, one of the teachers, Asha Bates, who knows Acorna well, believes Khorii, and knows that the pupils will starve without those supplies, so she uses her own ship, to meet up with the supply ship.
Unfortunately, the school bully, Marl Fidd, who had already almost killed Khiindi, knows what she's doing, so blackmails her into letting him come along.
Unfortunately, all the crew, apart from the young daughter of the supply crew, Jaya, have died by the time Khorii gets to the ship, but Khorii sees all the plague dots everywhere, and starts to clear both crew, cargo, and ship.
But, while everyone is busy getting the supplies down to MOO, Marl catches Hap by surprise, knocks him out, and ties him up in the engine room, then he puts small packages of explosives all over the supply ship.
When everyone gets back there, he grabs Sesseli as a hostage, and forces everyone to take him to one of the planets in the Solojos System, where all the rich lived, then, with the threat of blowing up the ship, with them on it, he supervises them to gather up warehouses worth of drugs.
While he's doing this, Khiindi manages to get into the engine room and with much effort, and lots of blood, helps Hap to escape his bonds. Hap follows Khiindi all around the ship, as the cat points out where Marl has placed the explosives, and disarms them then, as Marl returns to the ship, Hap manages to knock him out for enough time to disarm him, then tie him up.
None of them will ant to deal with Marl so, in the end, they drop him back onto the planet he had just stolen from, and let the plague survivors, Khorii had helped, deal with him.
From then on, it's a race against time, as Khorii joins in with trying to clean the plague from wherever it touches but, unfortunately, Acorna and Aari got so tired and overworked, that the plague mutated and, though it couldn't kill them, they became carriers themselves.
Khorii meets back up with her parents, but can't heal them of the mutated strain, so it's decided that Acorna and Aari, plus Becker and Maak, should go back to Vhiliinyar, to see if the Ancestors can help cure her parents
The book ends with Khorii vowing to find the entity who, they had discovered, had deliberately spread the terrible plague.