The Skyscraper Rocket ship has returned to Earth. All the adult residents have forgotten about being in space and have just gone back to their ordinary lives as if they never left. Everyone is miserable again and Johnny and Laura are back at school. The worst affected is Emma, whom nobody, except Johnny and Laura, remembers. The PGBC fleet is on its way and everyone in the whole world is going to get sick. Johnny, Laura and Emma need to find some...