How would you like to visit a monster? And have a monster to stay with you? Eddie is one of the first lucky children to take part in a Monster Swap, and is going to visit young monster Fenda in her monster world. Fenda is three feet tall and covered with springy green hair, and can jump higher than a house. Can Eddie help Fenda's family save their ailing monster funfair? He doesn't quite know what's in store for him - but it's going to be pretty crazy!