It's the last day of term. Three lads are clearing out their lockers and organising a sleepover. 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.
When CHERUB kids go undercover, no one suspects that they are trained professionals, working to infiltrate criminal organisations that have eluded MI5 and the police for years.