In the aftermath of Phobos Station's destruction, sinister forces fight to control humanity's fragile first steps in colonizing other worlds. There are competing agendas at work. Some seek to overthrow the Corporations and Governments, others just want to see everything burn. In the midst of it all, Captain Ellisa Shann and her crew are fighting to survive and to unlock the secrets of a mysterious and ancient alien ship. Vigilance is the conclusion to the epic science fiction story that began with Fearless and continued with Resilient. What new revelations await in the ongoing Fractal Series?