The CHERUB series follows the life of a character named James Adams (formerly James Choke) and his younger half-sister Lauren Adams (formerly Lauren Onions), a member of CHERUB (Charles Henderson's Espionage Research Unit B), a top-secret branch of the British Secret Service. The organisation recruits orphaned children and trains them as spies. Once qualified, they are used to investigate targets ranging from international terrorists to gang leaders. As children, they are considered innocent by their targets. CHERUB agents start basic training at the age of ten. Basic training is a gruelling, tiresome 100-day course that prepares CHERUBs for the dangers they could face during missions. CHERUB agents are then eligible for missions upon completion. Once passed basic training, agents take part in missions, before retiring at the age of seventeen.