George Knight, a normal nine-year-old living with his mum in a London flat, has his world change forever and ends up on CHERUB campus with a best friend who's always getting him into trouble and two really annoying girls who live down the corridor and love winding him up. And then there's basic training...

A south London gang are training children to do their dirty work, and the only people who can stop them are highly-trained CHERUB agents. George gets his first real mission with his best friend Rex and both of them know that being successful could make all the difference in their careers as agents. If only they could stay out of trouble. (Sequel to CHERUB: Knight)