Gretchen and Paul, refugees from a dead Earth, have found the old Colony Ship Vanguard. The ship is on its generations long journey to another solar system. The ship has suffered a severe epidemic and not everything is functional. The various biological habitats are vast and unexplored by Gretchen and Paul. What will they find as they explore and investigate the old ship? Will they find friends or enemies? Will anyone believe they really have come from Earth? What will their new lives be like, trapped on the Vanguard?