McDragon has disappeared without a trace! As dragonkin, Petersmith, as the dragons call him, now finds he is tasked with discovering what on earth has happened to the big black dragon. He is aided in his quest by a most unlikely person.
Spit, Peter’s dragon friend was keeping Peter up to date on the mystery of McDragon but the dragon scale they use to communicate through has been lost or stolen. Peter suspects bully boy, Biffy, of taking it while they were on a field trip with the school.
One day, Peter notices that the end of a rainbow moves and he goes to investigate. To his enormous surprise a very old dragon emerges from the rocks. She is called Effel and is a dragon seer and she was the one who had moved the end of the rainbow. She too is concerned about McDragon and takes Peter, in dragon time, to the island where the other dragons live.
While they are on the island the evil squawkins drop a surprise parcel and fly away. The smell is familiar – it smells of McDragon.
Can Petersmith discover where McDragon has gone and find a way to rescue him?