In Cherub's books, you affirm that the above mentioned organization is real (or a very similar one), but that its existence is secret. ... CHERUB isn't real.

Is the CHERUB organization real?

Setting. The series' main location is CHERUB campus, the headquarters of the fictional titular British government agency CHERUB for which the children work. It was formed during World War II by Charles Henderson; a British spy who had used children during an operation in France.

What is CHERUB Organisation?

CHERUB is a secret organisation that recruits orphans aged eleven to seventeen to go on missions for intelligence agencies like the FBI or MI5.