in the late 21st century, man-made, self-replicating organisms called mycora Рsmaller than bacteria Рmutate and sweep across the globe in a chain reaction so swift and deadly there is not time to do anything but flee from an Earth destroyed buy the science created to sustain it. Now the remnants of humanity, clinging to the asteroid belt and the moons of Jupiter are about to face their greatest test. Mycora  are incorporating gene sequences to elude human defences, perhaps eve to thrive in the harsh environment of the outer system.  The only way to counter this is for the few surviving members of mankind to go to the diseased heart of the Mycosystem РEarth.