Cherub:The Fall

The longest book in the Cherub Series, with 859 pages it is an amazing book,
It iss about an M15 operation that goes wrong, terribly wrong
when two agents working with James Adams (The hero in the cherub series, he wears a black shirt , his shirt means that he is the most succsessful operator in cherub.) murders their primary subject within Aero City, Russia. He is not able to contact campus and when he attempts to,he is beaten up badly by a group of Russian thugs. These thugs worked for the Mafia.
Half a week later, James wakes up in hospital near CHERUB campus, to the relief of Lauren and Kerry
His sister Lauren is then sent on her first solo mission, making friends with a young Russian girl named Anna, a victim of a brutal human trafficing operation. After the Russia disaster, James has been suspended from all missions and after a talk with one of the teachers, he suspects Ewart, the mission controller, for betraying him, and asks Dana, another CHERUB agent to help him search Ewart's files to find a clue to what he is hiding.They end up dating.