The only way to defeat the invaders is to discover what happened the first time around, 17,000 years in the past. Feisty and passionate, Leah is very like her mother with whom she agrees on nothing, but this time there's no choice; she is the only one who can go back.

Leah occupies the mind of Flight Lieutenant Leanne Fon, a fighter pilot who died during the first invasion, and faces two choices; find the secret weapon used to stop the invaders; or prevent the emergence of City 5, which means she won't exist. However, Leanne's in love with the man Leah must kill, and the past holds secrets no one could ever guess.