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Within a space opera landscape, Harmony explores the spirituality of a different human culture bound by a rigid caste system. Laudae Sissy, the new High Priestess of the world called Harmony, reaches across all seven castes of her society, seeking a new unity that will protect their isolation from the rest of the galaxy. But other cultures and races are testing their borders, searching for the most valuable commodity in civilized space.

Bob Johansson didn't believe in an afterlife, so waking up after being killed in a car accident was a shock. To add to the surprise, he is now a sentient computer and the controlling intelligence for a Von Neumann probe. Bob and his copies have been spreading out from Earth for 40 years now, looking for habitable planets. But that's the only part of the plan that's still in one piece.

While the crew of the starship Flying Dutchman have been trying to assure that hostile aliens do not have access to Earth, the UN Expeditionary Force has been stranded on the planet they nicknamed "Paradise". The Flying Dutchman is headed back out on another mission, and the UN wants the ship to find out the status of the humans on Paradise. But Colonel Joe Bishop warns that they might not like what they find, and they can't do anything about it without endangering Earth.