While salvaging equipment in the Arizona desert, Commander Charlie Jackson receives orders from Space Command to take his crew and the Perseus, a low-orbit repair unit, to the Strivo Corridor to destroy the supply lines feeding the latest Obsidian invasion. Charlie and his brother and third-in-command, Jacob, also receive a mysterious second mission.Despite his wife Maddie's objections and the fact that he is nearing retirement, Charlie accepts the mission. With the Obsidians one s...