Twelve-year-old Amelia and the dog-boy Greeny have disobeyed their captain's orders. They stowed away to join a mission where they'll gather valuable junk from a debris field. But soon the life signs of the adult crew members blink off. Alarms start blaring, "Intruder alert " Aliens have boarded their ship. Can Amelia and Greeny escape the deadly invaders, or will they be destined to join the lifeless mass of space scrap?