Invasion America #2
 
This second novel in the Invasion America series takes place before the birth of young hero David Carter, telling the story of his parents--his alien father and human mother. Cael, a Tyrusian Prince, flees to Earth from his homeworld to evade the military dictatorship which has overthrown him. He is befriended by Rita, a human woman who helps him assimilate to her world's culture. But even as the couple acknowledge the love between them, the evil Tyrusians have created a deadly virus to annihilate Earth's inhabitants. Cael and Rita struggle to stop this dire threat in order to protect their unborn child...the future heir to the Tyrusian throne!