Yesterday's Kin

A deadly cloud of spores has already infected and killed the inhabitants of two worlds. Now the plague is heading for Earth, threatening humans and aliens alike. Can either species be trusted to find the cure? Geneticist Marianne Jenner is immersed in the desperate race to save humanity, yet her family is tearing itself apart. Siblings Elizabeth and Ryan are strident isolationists who agree only that an alien conspiracy is in play. Marianne's youngest, Noah, is a loner addicted to a drug that constantly changes his identity.

Ten years after the aliens left Earth, humanity has succeeded in building a ship, Friendship, in which to follow them home to Kindred. Aboard are a crew of scientists, diplomats, and a squad of Rangers to protect them. But when the Friendship arrives, they find nothing they expected: no interplanetary culture, no industrial base, and no cure for the spore disease. A timeslip in the apparently instantaneous travel between worlds has occurred, and far more than 10 years have passed.

The diplomatic mission from Earth to World ended in disaster, as the Earth scientists discovered that the Worlders were not the scientifically advanced culture they believed. Though they brought a limited quantity of the vaccine against the deadly spore cloud, there was no way to make enough to vaccinate more than a few dozen. The Earth scientists, and surviving diplomats, fled back to Earth. But once home, after the 28-year gap caused by the spaceship transit, they find an Earth changed almost beyond recognition.