Another year brings another handful of planets for Lisa to visit, as her struggle to rebuild society generations after the "Savage Rain" continues. These journeys won't be like any other Lisa and her friends have taken. One world was devastated by a mysterious disaster in the past. On another world, an ancient machine is still running. And past that second world is Earth. ​​​​​​​Why didn't Earth stop the Savage Rain? Can they help Lisa's effort? What will Lisa discover when she goes through that last hyperspace gate?