If Tomorrow Comes

"Ten years after the Aliens left Earth, humanity succeeds in building a ship, Friendship, 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 ten years have passed"--Amazon.com.