Years after an alien invasion devastated Earth, a lone Marine makes a desperate final effort to go back in time and change history, saving the lives of eleven billion people. A young woman, caught up in the crossfire between Civil Security and Usurpation aliens, takes up arms against her oppressors to avenge her mother. The young but competent Admiral of Earth's last remaining spacefleet prepares himself and his men for the final wave of the invasion of his home. Will the Marine be able to fight his way forward to the past? Will Lyric get revenge on the people who killed her mother? Will Admiral Cooper be able to hold out against the Falkoks? The fate of many lies with few.