he fourth book "The Paradise Game" beings with the Hooded Swan is on the planet Pharos, so that Charlot can mediate a dispute between the Caradoc company and a group called Aegis. The Caradoc company found a planet and began modifying it on a large scale into Paradise, for sale to the ultra-wealthy. Unfortunately, after they had begun, they discovered the planet was already inhabited by an intelligent, though primitive race. Caradoc claims to have signed a treaty with the aliens that promises eternal cooperation with Caradoc's goals. Aegis is a public interest group trying to fight on behalf of the aliens. Grainger saves a female alien from Caradoc employees. Charlot ask for help from Grainger because he want to know how can he rid Caradoc off the planet. As Grainger investigates he learns that death seems to be completely unknown on the local life of Pharos, and that it's in complete balance. He and Charlot hypothesize that the development of a mutational filter now controls evolution there, rather than the traditional natural selection, and it has nudged the environment into complete stability. He learns that there's a secret Caradoc battleship in orbit, just waiting for justification to land, and secondly, Johnny's found a hole which contains an interesting fossil... a large predator with claws and teeth, suggesting that the world was not always so peaceful. Before Grainger can discover what this means, he learns that one of the natives has been murdered, by Varley. While the authorities take him to the Hooded Swan, Aegis, in a frustrated attempt to protest what they see as bias in Charlot's investigation, causes an explosion that destroys some of Caradoc's equipment. Varley escapes in the confusion, and, using the hunt for a fugitive as a pretext, the Caradoc troops are called down. Grainger and Eve are later caught by Varley in the woods, who demands to be turned over to the Hooded Swan, rather than Caradoc. On the way back, he dies from some unknown infection. Later, it's learned there's sickness suddenly reported by many people on the planet, although none as serious as Varley's. It's Grainger who puts it together. The mutational filter has adapted itself to humanity, and it triggers the viruses in the human body to become fatal whenever it detects violent emotion. The entire colony is quarantined and everyone has to try and reign in their emotions, and Grainger, with the help of the wind, comes up with a theory that helps Charlot develop a workable cure, although there are some deaths in the meantime.
