If he loses her, he'll lose his will to fight.
Shane and his friends survive the first major attack against the enemy, destroying the alien ships that came to harvest the children of Earth and turn them all into slaves. However, one ship escaped, and the aliens have captured Kelly. Shane will do whatever it takes to save her, but turning his back on his friends could jeopardize the whole mission.
The enemy invades Kelly's mind, turning her into a slave soldier. She'll follow their orders, even if it means murdering her friends, including her little sister and Shane. She is helpless, trapped inside her body while it performs heinous tasks under the direction of her new masters, while her sanity and desire to live fade.
Shane returns home to make a rescue attempt, only to find Kelly commanding an army of human slave soldiers, and she's determined to make him join her ranks. Will Shane save Kelly before she gets to her sister, or will she help the enemy enslave the rest of humanity?