Boom! Is a roller-coaster read with spaceships spies and mortal danger! Jim and his best
friend Charlie weren't looking for adventure when they decided to bug the staffroom...But then
they overhear their teachers speaking in a secret language and it's too late to turn back. And
now they have to explain to the police the headmistress and their parents where they've been
for a whole week - without mentioning the aliens.
