Cherub is a secret branch of MI5, for children. Made up mostly of orphaned children recruited from Care Homes, these kids receive the highest level of education in the UK, and often go on to the top Universities. By the time they leave at the age of 18 years they will be fluent in more than one alternative language. They will also have completed basic training: six months of cold, hard exercise, little sleep, little food and no comfort. They will also have completed a number of missions in which children are used to do things that adults cannot. Being a member of Cherub is completely optional, and children can refuse to be a part or drop out anytime. They can also refuse to do any mission which they are asked to go on. 'The reason for Cherub's existance is simple: adults never suspect that children are spying on them.'
This is tough, but Cherub's are tougher.