Train Heartnet, also known as "Black Cat," was an infamous assassin for a secret organization called Chronos...until he abandoned that cold-blooded existence to live on his own terms as an easygoing bounty hunter. But is Train's past as far behind him as he thinks? Glin, a mysterious information broker, is forming a Sweeper Alliance in order to destroy Creed and the Apostles of the Stars. He invites Train, Eve and Sven to join their group. But even if this motley crew can locate the Apostles’ hiding place, will they be able to survive the perilous journey to get there?