Their missions are dangerous, and they are all venturing into the unknown... and if they can uncover the secret to faster-than-light travel then new worlds will be at our fingertips.
But innovation and progress are not always embraced by everyone. There is a saboteur at work. Different factions disagree about the best way to move forward. And the mysterious Watchkeepers are ever-present.
Completing the informal trilogy which began with Blue Remembered Earth and On the Steel Breeze, this is a powerful and effective story.