Years after their father's disappearance on the maiden voyage of his exploratory space ship, The Outer Heaven, the four Angelus brothers had gone their separate ways. The eldest brother Davriel, enlisted in the United Terran Federation Marine Corps, the elder twin, Jonos, followed a childhood interest in aviation while the younger, Savos, grew detached from his surroundings and moved abroad in an attempt to find his place in the world, while the youngest brother Cephus enrolled in the UTF Naval Guard Academy. After several years of unsuccessful searching, Savos now returns to his hometown and reunites with his twin brother Jonos-a highly skilled pilot and flight instructor. Together, the twins will discover a secret about their father so massive that it shatters their perception of life itself. Fate intervenes with another reunion and together they embark on a journey of discovery and peril while tracing their father's footsteps and forging further into the final frontier.