Sent from the planet Djan, and now disguised as a normal schoolboy, Jodie's mission is to investigate and report why pollution levels are rising so fast on the planet Earth. In theory the mission is safe, but now Jodie's Calling Crystal is flashing a warning - there is a hostile alien force nearby and it has begun to track him down. A fast-paced science fiction story to promote discussion on the environment and the concept of friends and "outsiders".