Book I of  The Xeelee Sequence. Five hundred years after a spaceship from Earth accidentally crossed through a hole in space-time to another – and very strange – Universe, the crew’s descendants are still struggling for existence on The Raft, a structure built from the ship’s wreckage. A small group of scientists preserve the ancient knowledge necessary for survival.  But now they must contemplate a journey far more dangerous than that of their ancestors – or die. Cover art by Chris Moore.