It's the last day of term. Three lads are clearing out their lockers, organising a sleepover and hatching a plan to spatter a girl with rancid coleslaw.

But things aren't what they seem. One boy's father is a member of Dark Sun, a criminal organisation dealing in nuclear weapons technology, while another is a CHERUB agent sent to stop him.

CHERUB kids live in the real world, slipping under adult radar and getting information that sends criminals and terrorists to jail.

For official purposes, these children do not exist.