Seventeen years old is much to young to take on an entire alien empire.When the small communities of Corros, a remote human colony world, come under attack from the Tolleani, an alien species with whom humanity is at war, Echo, a young woman, finds herself the sole survivor.For three years she survives alone, wondering why nobody has come to rescue her. Then, the aliens return to set up a research base at the community which had once been her home...