CHERUB

CHERUB is a series of young adult spy books. It is written by English author Robert Muchamore. The series is about a division of the British Security Service named CHERUB. CHERUB takes on children, mostly orphans, as spies. CHERUB stands for Charles Henderson's Espionage Research Unit B. This was revealed in the book "Secret Army", a book in Muchamore's other series, "Henderson's Boys".