Gridzbi Spudvetch!

Gridzbi Spudvetch! was later revised and published as Boom! (2010).

Nine-year-old Jimbo gets into his fair share of scrapes, but nothing can prepare him for the adventure he and his mate Charlie get into when they plant a walkie-talkie in the staff room and overhear two of their teachers speaking gobbledegook - or is it some secret language? The two boys decide to investigate and become caught up in dangerous events that are, quite literally, out of this world.